EXHIBIT(3)(ii)

                         MINE SAFETY APPLIANCES COMPANY

                          (A Pennsylvania Corporation)

                                     By-Laws

                          As Amended to March 13, 2001*

                                   * * * * * *

                                    ARTICLE I
                            Meetings of Shareholders

            Section 1.01. Annual Meetings. An annual meeting of the shareholders
shall be held at each year within five months after the end of the fiscal year
of the Company on such day and at such time and place as may be designated by
the Board of Directors, or if not do designated on the third Wednesday of April
in each year if not a legal holiday, and if a legal holiday then on the next
business day following, at 10:00 o'clock A.M., local time, at the principal
office of the Company.

- ---------------------------
* Note: References in the By-Laws to the "Restated Articles" are to the Articles
of the Corporation as amended by resolutions adopted at the Annual Meeting of
shareholders on May 23, 1986, and as they may be thereafter amended or
supplemented. Section references in brackets are to specific provisions of the
Restated Articles, and indicate that the preceding provision is taken
substantially verbatim from the Restated Articles; and capitalized terms are
used as those terms are defined in the Restated Articles.


            Section 1.02.  Business at Annual Meetings.
                           ---------------------------

            (a) Business Agenda. The business at an annual meeting of
                ---------------
shareholders shall include: (i) a review of the business of the preceding year;
(ii) the election of directors to succeed those whose terms shall expire; (iii)
the selection of auditors; and (iv) such other business as may properly be
brought before the meeting as provided in this Section 1.02. If for any reason
the annual meeting is not held at the time fixed therefor, the election of
directors may be held at a subsequent meeting called for that purpose.

            (b) Notice of Business to be Presented. The proposal of business to
                ----------------------------------
be considered by the shareholders at an annual meeting of shareholders may be
made (i) pursuant to the Company's notice of meeting, (ii) by or at the
direction of the Board of Directors or (iii) by any shareholder of the Company
who was a shareholder of record at the time of giving of notice provided for in
this Section, who is entitled to vote at the meeting and who has complied with
the notice procedures set forth in this Section. For business to be properly
brought before an annual meeting by a shareholder pursuant to clause (iii) of
the preceding sentence, such business must be a proper matter for shareholder
action, the shareholder must have given timely notice thereof in writing to the
Secretary of the Company and such notice must comply with the following
requirements:

            (1) To be timely, a shareholder's notice given pursuant to this
      Section must be received at the principal executive offices of the
      Company, addressed to the Secretary, not less than 120 calendar days
      before the anniversary date of the Company's proxy statement released to
      shareholders in connection with the previous year's annual meeting or, if
      none, its most recent previous annual meeting. Notwithstanding the
      preceding sentence, if the date of the


                                      -2-


      annual meeting at which such business is to be presented has been changed
      by more than 30 days from the date of the most recent previous annual
      meeting, a shareholder's notice shall be considered timely if so received
      by the Company (A) on or before the later of (x) 150 calendar days before
      the date of the annual meeting at which such business is to be presented
      or (y) 30 days following the first public announcement by the Company of
      the date of such annual meeting and (B) not later than 15 calendar days
      prior to the scheduled mailing date of the Company's proxy materials for
      such annual meeting. In no event shall the public announcement of an
      adjournment of an annual meeting commence a new time period for the giving
      of a shareholder's notice as described above.

            (2) A shareholder's notice given pursuant to this Section shall set
      forth (A) the name and address of the shareholder who intends to make the
      proposal and the classes and numbers of shares of the Company's stock
      beneficially owned by such shareholder; (B) a representation that the
      shareholder is and will at the time of the annual meeting be a holder of
      record of stock of the Company entitled to vote at such meeting on the
      proposal(s) specified in the notice and intends to appear in person or by
      proxy at the meeting to present such proposal(s), (C) a description of the
      business the shareholder intends to bring before the meeting, including
      the text of any proposal or proposals to be presented for action by the
      shareholders, (D) the name and address of any beneficial owner(s) of the
      Company's stock on whose behalf such business is to be presented and the
      class and number of shares beneficially owned by each such beneficial
      owner and (E) the reasons for conducting such business at the meeting and
      any material interest in such business of such shareholder or any such
      beneficial owner.


                                      -3-


            (c) General. (i) Only such business shall be conducted at an annual
                -------
      meeting of shareholders as shall have been brought before the meeting in
      accordance with the procedures set forth in this Section, and only such
      business shall be conducted at a special meeting of shareholders as shall
      have been brought before the meeting in accordance with the procedures set
      forth in Section 1.04. The Chairman of the meeting shall have the power
      and the duty to determine whether any business proposed to be brought
      before a meeting was proposed in accordance with the procedures set forth
      in those Sections and, if any business is not in compliance with those
      Sections, to declare that such defective proposal shall be disregarded.

            (ii) For purposes of this Section, (A) "public announcement" shall
      mean disclosure in a press release reported by the Dow Jones News Service,
      Associated Press or comparable national news service or in a document
      publicly filed by the Company with the Securities and Exchange Commission
      pursuant to Section 13, 14 or 15(d) of the Securities Exchange Act of 1934
      (the "Exchange Act") and (B) "beneficial ownership" shall be determined in
      accordance with Rule 13d-3 under the Exchange Act or any successor rule.

            (iii) Notwithstanding the foregoing provisions of this Section, a
      shareholder shall also comply with all applicable requirements of the
      Exchange Act and the rules and regulations thereunder with respect to the
      matters set forth in this Section. Nothing in this Section shall be deemed
      to affect any rights of a shareholder to request inclusion of a proposal
      in the Company's proxy statement pursuant to Rule 14a-8 under the Exchange
      Act, or any successor rule, or to present for action at an annual meeting
      any proposal so included.

[Amended by the Board of Directors 3/13/01.]


                                      -4-


            Section 1.03. Special Meetings. Except as other-wise required by law
                          ----------------
and subject to the rights of the holders of any class or series of preferred
stock with respect to any vote of the holders of such class or series when
voting by class, special meetings of shareholders of the Company may be called
only by the Board of Directors pursuant to a resolution approved by a majority
vote of the Disinterested Directors (as that term is defined in the Restated
Articles). [Restated Articles Section 12.03] Special meetings shall be held at
such place as may be designated by the Board of Directors, or if not so
designated, at the principal office of the Company.

            Section 1.04. Business at Special Meetings. No business may be
                          ----------------------------
transacted at any special meeting of share-holders other than that the general
nature of which has been stated in the notice of meeting, and business which is
incidental or germane thereto.

            Section 1.05. Notice of Shareholders' Meetings. Written notice
                          --------------------------------
specifying the place, date and time of each meeting of the shareholders and the
purpose or purposes for which the meeting is called shall be given to all
share-holders of record entitled to vote at such meeting at least ten days
before the day named for the meeting.

            Section 1.06. Quorum; Organization. A share-holders' meeting duly
                          --------------------
called shall not be organized for the transaction of business unless a quorum is
present. At any meeting the presence in person or by proxy of shareholders
entitled to cast at least a majority of the votes which all shareholders are
entitled to cast on the particular matter shall be necessary and sufficient to
constitute a quorum for the purpose of considering such matter. The shareholders
present at a duly organized meeting can continue to do business until
adjournment, notwithstanding the withdrawal of enough shareholders to leave less
than a majority. If a meeting


                                      -5-


cannot be organized because a quorum has not attended, those present in person
or by proxy may adjourn the meeting to such time and place as they may
determine, without notice other than announcement at the meeting, until a quorum
as aforesaid shall be present; and in the case of any meeting called for the
election of directors, such meeting may be adjourned only from day to day, or
for such longer periods not exceeding fifteen days each, as may be directed by
shareholders who are present in person or by proxy, and those who attend the
second of such adjourned meetings, although entitled to cast less than a
majority of the votes which all outstanding shares are entitled to cast, shall
nevertheless constitute a quorum for the purpose of electing directors. The
Chairman, or in his absence, the President, shall preside, and the Secretary
shall take the minutes, at all meetings of the shareholders. In the absence of
the foregoing officers the presiding officer shall be designated by the Board of
Directors or if not so designated selected by the shareholders present; and in
the absence of the Secretary, the presiding officer shall designate any person
to take the minutes of the meeting.

            Section 1.07. Vote Required; Meeting Procedure. When a quorum is
                          --------------------------------
present at any meeting, the vote of share-holders present, in person or by
proxy, entitled to cast at least a majority of the votes which al shareholders
present and voting (excluding abstentions) are entitled to cast on the
particular matter shall decide any question brought before such meeting, except
that (a) if the question is one upon which, by express provision of statute or
of the Restated Articles, a different or additional vote is required, such
express provision shall govern, (b) all elections shall be determined by a
plurality of the votes cast, and (c) in the case or privileged, subsidiary or
incidental motions or questions involving the convenience of the shareholders
present, the Chairman may call for a per capita vote, either by voice or by show
of hands. Elections for directors need not be by


                                      -6-


ballot, unless otherwise ordered by the presiding officer at the meeting or
unless a demand is made by a shareholder at the meeting and before the voting
begins. The chairman of any meeting shall determine the order of business and
the procedure at the meeting, including such regulation of the conduct of
discussion as seems to him in order. The conduct of meetings shall be governed
by accepted corporate practice, the fundamental rule being that all who are
entitled to take part shall be treated with fairness and good faith.

            Section 1.08. Proxies; Appointment and Revocation. Every shareholder
                          -----------------------------------
entitled to vote at a meeting of shareholders or to express consent or dissent
to corporate action in writing without a meeting may authorize another person or
persons, but not more than three, to act for him by proxy. Every proxy shall be
appointed by an instrument in writing (including telegram, cable or radio-gram,
telex or similar transmission), executed by such shareholder or by his
authorized attorney, and filed with the Secretary of the Company. A proxy shall
not be revoked by the death or incapacity of the maker unless, before the vote
is counted or the proxy is exercised, written notice of such death or incapacity
is given to the Secretary of the Company.

                                   ARTICLE II

                                    Directors
                                    ---------

            Section 2.01. Number, Election, etc.
                          ----------------------

            (a) Number. The whole Board of Directors shall consist of such
                ------
number of persons, not less than 5 nor more than 15, as may from time to time be
determined by the Board pursuant to a resolution adopted by a majority vote of
the Disinterested Directors then in office. [Restated Articles Section 10.1(a)]


                                      -7-


            (b) Classes; Election and Terms. Beginning with the Board of
                ---------------------------
Directors to be elected at the annual meeting of shareholders to be held in
1986, the directors shall be classified in respect of the time for which they
shall severally hold office by dividing them into three classes, as nearly equal
in number as possible. If the classes of directors are not equal, the Board of
Directors by a majority vote of the Disinterested Directors then in office shall
determine which class shall contain an unequal number of directors. At the
annual meeting of shareholders to be held in 1986, separate elections shall be
held for the directors of each class, the term of office of directors of the
first class to expire at the first annual meeting after their election; the term
of office of the directors of the second class to expire at the second annual
meeting after their election; and the term of office of the directors of the
third class to expire at the third annual meeting after their election. At each
succeeding annual meeting, the shareholders shall elect directors of the class
whose term then expires, to hold office until the third succeeding annual
meeting. Each director shall hold office for the term for which elected and
until his or her successor shall be elected and shall qualify. [Restated
Articles Section 10.1(b)]

            (c) Removal of Directors. Any directors, any class of directors or
                --------------------
the entire Board of Directors may be removed from office by shareholder vote at
any time, without assigning any cause, but only if shareholders entitled to cast
at least 80% of the votes which all shareholders would be entitled to cast at an
annual election of directors or of such class of directors shall vote in favor
of such removal; provided, however, that the shareholders shall have such power
of removal without cause only if and so long as the general corporate law of the
Company's state of incorporation specifically mandates such power. If such power
of removal without cause is not mandated by statute, the share-holders may
remove a director or directors from office at any time


                                      -8-


only for cause and only if, in addition to any vote required by any other
provision of law, the Articles or the By-Laws of the Company, such removal is
approved by the affirmative vote of at least a majority of the Voting Power of
the outstanding shares of Voting Stock of the Company which are not Beneficially
Owned by an Acquiring Person [Restated Articles Section 10.1(c)]

            (d) Vacancies. Vacancies in the Board of Directors, including
                ---------
vacancies resulting from an increase in the number of directors, shall be filled
only by a majority vote of the Disinterested Directors then in office, though
less than a quorum, except as otherwise required by law. All directors elected
to fill vacancies shall hold office for a term expiring at the annual meeting of
shareholders at which the term of the class to which they have been elected
expires. No decrease in the number of directors constituting the Board of
Directors shall shorten the term of an incumbent director. [Restated Articles
Section 10.1(d)]

            (e) Nomination of Director Candidates. Nominations for the election
                ---------------------------------
of directors may be made only by the Board of Directors or a committee appointed
by the Board of Directors or by any holder of record of stock entitled to vote
in the election of the directors to be elected; but a nomination may be made by
a shareholder only if written notice of such nomination has been given, either
by personal delivery or by United States mail, postage pre- paid, to the
Secretary of the Company not later than 90 days in advance of the meeting at
which the election is to be held. Each such notice shall set forth: (a) the name
and address of the shareholder who intends to make the nomination and of the
person or persons to be nominated; (b) a representation that the shareholder is
a holder of record of stock of the Company entitled to vote at such meeting and
intends to appear in person or by proxy at the meeting to nominate the person or
persons specified in the notice; (c) a description of all arrangements or
understandings


                                      -9-


between the shareholder and each nominee and any other person or persons (naming
such person or persons) pursuant to which the nomination or nominations are to
be made by the share- holder; (d) such other information regarding each nominee
proposed by such shareholder as would be required to be included in a proxy
statement filed pursuant to the proxy rules of the Securities and Exchange
Commission, had the nominee been nominated by the Board of Directors; and (e)
the consent of each nominee to serve as a director of the Company if so elected.
[Restated Articles Section 10.1(e)]

            (f) Exception for Directors Elected by Preferred Stock. Whenever the
                --------------------------------------------------
holders of any class or series of stock having a preference over the Common
Stock of the Company as to dividends or assets shall have the right, voting
separately as a class, to elect one or more directors of the Company, none of
the foregoing provisions of this Section 2.01 shall apply with respect to the
director or directors elected by such holders of preferred stock. [Restated
Articles Section 10.1(f)]

            (g) In case of a vacancy in the office of any director elected by
the preferred stock, the remaining directors or director elected by the
preferred stock may choose a successor who shall hold office for the unexpired
term in respect of which such vacancy occurred.

            (h) Each director shall hold office from the time of his election,
but shall be responsible as a director from such time only if he consents to his
election; otherwise from the time he accepts office or attends his first meeting
of the Board.

            Section 2.02. Organization Meeting; Notice. An organization meeting
                          ----------------------------
of the newly elected Board of Directors shall be held each year promptly after
the annual meeting of shareholders


                                      -10-


at a place designated by the Chairman or the President. At such meeting the
Board of Directors shall organize itself and elect the executive officers of the
Company and members of standing Committees for the ensuing year, and may
transact any other business. Notice of the organization meeting of the Board or
of the business to be transacted thereat shall not be required to be given,
except as otherwise expressly required herein or by law.

            Section 2.03. Regular Meetings; Notice. Regular meetings of the
                          ------------------------
Board shall be held at such time and place as shall be designated by the Board
of Directors from time to time, or if not so designated, as determined by the
Chairman or the President. Notice of such regular meetings of the Board shall
not be required to be given, except as otherwise expressly required herein or by
law, except that whenever the time or place of regular meetings shall be
initially fixed or changed, notice of such action shall be given promptly by
telephone or otherwise to each director not participating in such action. Any
business may be transacted at any regular meeting.

            Section 2.04. Special Meetings; Notice. Special meetings of the
                          ------------------------
Board may be called at any time by the Board itself by vote at a meeting, or by
any three directors, or by the Chairman or the President, to be held at such
place and day and hour as shall be specified by the person or persons calling
the meeting, or if not so specified by the Secretary. Notice of every special
meeting of the Board of Directors, which states the place, day and hour thereof,
shall be given to each director either by being mailed on at least the second
calendar day prior to the date of the meeting, or by being sent by telex or
telegraph or given personally or by telephone prior to the date of the meeting.
Neither the call of a special meeting nor the notice thereof need specify the
purpose thereof or the business to be transacted thereat, except as otherwise
expressly required herein or by law.


                                      -11-


            Section 2.05. Quorum. At all meetings of the Board of Directors, the
                          ------
presence or participation by other lawful means of a majority of the directors
in office shall be necessary and sufficient to constitute a quorum for the
transaction of business. The Directors present at a duly organized meeting shall
continue to constitute a quorum until adjournment, notwithstanding the
withdrawal of enough Directors to leave less than a majority. If a quorum is not
present at any meeting, the meeting may be adjourned from time to time by a
majority of the directors present, without notice other than announcement at the
meeting, until a quorum as aforesaid shall be present.

            Section 2.06. Action. Resolutions of the Board shall be adopted, and
                          ------
any action of the Board at a meeting upon any matter shall be taken and be
valid, with the affirmative vote of at least a majority of the directors present
at a meeting duly organized, except as otherwise provided herein, in the
Restated Articles or by law. The Chairman, or in his absence the President,
shall preside at all meetings of the Board of Directors. The Secretary shall
take the minutes at all meetings of the Board. In the absence of the foregoing
officers the Directors present shall select a member of the Board to preside;
and in the absence of the Secretary, the presiding officer shall designate any
person to take the minutes of the meeting. The yeas and nays shall be taken and
recorded in the minutes at the request of any director present at a meeting.

            Section 2.07. Participation Other Than By Attendance. One or more of
                          --------------------------------------
the Directors may participate in any regular or special meeting of the Board or
of a committee of the Board by means of conference telephone or similar
communications equipment by means of which all persons participating in the
meeting are able to hear each other, or by any other lawful means in lieu of
attendance, any may act by proxy to the extent at the time


                                      -12-


permitted by law. All directors so participating shall be deemed present at the
meeting.

            Section 2.08. Emergency Provisions. Notwithstanding any other
                          --------------------
provisions of law, the Articles or these By-Laws, during any emergency period
caused by war or any other national catastrophe or local disaster of sufficient
severity to prevent the conduct and management of the business and affairs of
the Company by its Board of Directors and officers as contemplated by the other
provisions of these By-Laws, a majority of the available Directors (or the sole
such Director) who have not been rendered incapable of acting because of
incapacity or the difficulty of communication or transportation to the place of
meeting shall constitute a quorum for the sole purpose of electing Directors to
fill such vacancies or to reduce the size of the full Board or both; and a
majority of the directors (or the sole survivor) present at such a meeting may
take such action. Directors so elected shall serve until the absent Directors
are able to attend meetings or until the shareholders act to elect Directors to
succeed them. During such an emergency period, if both the Board and the
Executive Committee are unable or fail to meet, any action appropriate to the
circumstances may be taken by such officers of the Company as may be present and
able. Questions as to the existence of a national catastrophe or local disaster
and the number of surviving members capable of acting shall be conclusively
determined at the time by the Directors or the officers so acting.

            Section 2.09. Presumption of Assent. Minutes of each meeting of the
                          ---------------------
Board shall be made available to each director at or before the next succeeding
regular meeting. Every director shall be presumed to have assented to such
minutes unless his objection thereto shall be made to the Secretary within two
days after such next regular meeting.


                                      -13-


            Section 2.10. Resignations. Any director may resign by submitting to
                          ------------
the Chairman of the Board or the President his resignation, which (unless
otherwise specified therein) need not be accepted to make it effective and shall
be effective immediately upon its receipt by such officer.

            Section 2.11. Committees.
                          ----------

            (a) Appointments; Powers. Except as otherwise provided in subsection
                --------------------
(b) pertaining to the Executive Committee, standing or temporary committees
shall consist of one or more Directors of the Company and such other members,
who need not be directors, as the Board may direct and may be appointed from
time to time by a majority of the Directors present or participating at any
regular or special meeting. The Board may from time to time invest committees
with such power and authority, subject to such conditions as it may see fit,
except that no committee shall have any power or authority to adopt, amend or
repeal any By-Law.

            (b) Executive Committee. An Executive Committee of three or more
                -------------------
directors may be appointed by resolution adopted by a majority of the directors
in office; it shall have all the powers and exercise all of the authority of the
Board during intervals between meetings, except as specially limited by the
Board. Meetings of the Executive Committee may be called at any time by any
member, to be held at such place and day and hour as shall be specified by the
person or persons calling the meeting, or if not so specified by the Secretary.
Notice of every meeting of the Executive Committee, which states the place, day
and hour thereof, but need not state the purposes thereof, shall be given to
each member either by being mailed on at least the second calendar day prior to
the date of the meeting, or by being sent by telegraph or given personally or by
telephone prior to the date of the meeting. the presence or participation by
other lawful means of a majority of the members of the Committee shall be
necessary and sufficient


                                      -14-


to constitute a quorum for the transaction of business, and any action of the
Committee upon any matter shall be taken and be valid with the affirmative vote
of at least a majority of the members of the Committee. The Executive Committee
shall keep a record of all action taken and report such action to the Board of
Directors at its next meeting thereafter.

            (c) Term; Vacancies; Absence or Disqualification. All committee
                --------------------------------------------
members appointed by the Board shall serve during the pleasure of the Board,
which may fill vacancies and may designate one or more Directors as alternate
members of any committee, to take the place of any absent or disqualified member
at any meeting. In the absence or disqualification of any member or alternate
member of any committee or committees, the member or members thereof
participating at any meeting and not disqualified from voting, whether or not
he, she or they constitute a quorum, may unanimously appoint another Director to
act at the meeting in the place of any such absent or disqualified member or
alternate member.

            (d) Organization; Finality of Action. All committees shall keep such
                --------------------------------
record of the transactions of their meetings as the Board or these By-Laws shall
direct. All committees shall determine their own organization, procedures, and
times and places of meeting, unless other- wise directed by the Board and except
as otherwise provided in these By-Laws. Any action taken by any committee shall
be subject to alteration or revocation by the Board; provided, however, that
third parties shall not be prejudiced by such alteration or revocation.

            Section 2.12. Compensation. By resolution of the Board, Directors
                          ------------
may be paid a fixed sum and expenses, if any, of attendance for any regular or
special meeting of the Board or any committee, and may in addition be paid an
annual retainer fee or a


                                      -15-


retirement allowance, or both. Directors shall also be entitled to receive such
compensation for services rendered to the Company as officers, committee
members, or in any capacity other than as directors, as may be provided from
time to time by resolution of the Board. [Amended by Board of Directors
12-17-87.]

                                   ARTICLE III

                             Officers and Employees
                             ----------------------

            Section 3.01. Executive Officers. The executive officers of the
                          --------------------
Company shall be the Chairman of the Board, the President, one or more Vice
Presidents (as may be determined by the Board of Directors), the Secretary and
the Treasurer. The executive officers shall be elected by the Board of
Directors. Any two or more offices may be held by the same person, except that
the same person shall not be President and Secretary. Each executive officer
shall hold office at the discretion of the Board until the next succeeding
annual meeting of the Board of Directors and thereafter until his or her
successor is duly elected and qualifies, or until his or her earlier death,
resignation or removal. The Board may authorize the Company to enter into
employment contracts and/or consulting agreements with any executive officer for
such periods as may be deemed appropriate including periods longer than one
year, and the provision herein for annual election shall be without prejudice to
the contract rights, if any, of executive officers under such contracts.

            Section 3.02. Additional and Assistant Officers, Agents and
                          ---------------------------------------------
Employees. The Board of Directors, the Chairman and the President each may from
- ---------
time to time appoint or hire one or more other officers, assistant officers,
agents, employees and independent contractors as are deemed advisable; and the
Board of Directors, the Chairman or the President may prescribe their duties,
conditions of employment and compensation and may dismiss


                                      -16-


them without prejudice to their contract rights, if any. [Amended by Board of
Directors 8-29-90.]

            Section 3.03. The Chairman of the Board. The Chairman of the Board,
                          -------------------------
who shall be elected from among the Directors, shall be the Chief Executive
Officer of the Company and shall preside at all meetings of the Board of
Directors and of the Shareholders. He shall exercise the powers and perform
duties usual to the Chief Executive officer and, subject to the control and
direction of the Board of Directors, shall have management and supervision over
and exercise general executive powers concerning all the property, business and
affairs of the Company. He shall see that all policies, programs, orders and
resolutions of the Board of Directors are carried into effect, and shall have
such other powers and duties as from time to time may be assigned to him by the
Board of Directors or these By-Laws. He shall have the power to execute deeds,
bonds, mortgages, and other contracts, agreements and instruments of the
Company. He shall be, ex officio, a member of all standing committees of the
Board except the committee on officers' compensation. [Amended by Board of
Directors 6-27-90.]

            Section 3.04. The President. The President shall be subject to the
                          -------------
control and direction of the Chairman of the Board and shall direct and
supervise those affairs of the Company assigned to him by the Chairman, the
Board of Directors, or the By-Laws. In the absence of or disability of the
Chairman of the Board, the President shall be the Chief Executive Officer. He
shall have the power to execute deeds, bonds, mortgages, and other contracts,
agreements and instruments of the Company. [Amended by Board of Directors
6-27-90.]

            Section 3.05. The Vice Presidents. The Vice Presidents, one or more
                          -------------------
of whom may be designated executive, senior, group or administrative vice
president, or given other descriptive title,


                                      -17-


shall have such powers and perform such duties in such capacities as may be
assigned by the Board of Directors or the Chairman of the Board. [Amended by
Board of Directors 6-27-90.]

            Section 3.06. The Secretary. The Secretary shall: (a) be custodian
                          -------------
of the Company's contracts, policies, leases, deeds and other indicia of title,
and all other business records; (b) keep or cause to be kept at the registered
office or the principal place of business of the Company an original or
duplicate record of the proceedings of the shareholders and the Board of
Directors, and a copy of the Articles of the Company and of these By-Laws; (c)
attend to the giving of notices of the Company as may be required by law or
these By-Laws; (d) be custodian of the corporate records and of the seal of the
Company and see that the seal is affixed to such documents as may be necessary
or advisable; (e) have charge of and keep at the registered office or the
principal place of business of the Company, or cause to be kept at the office of
a transfer agent or registrar an original or duplicate share register, giving
the names of the shareholders in alphabetical order, and showing their
respective addresses, the number and classes of shares held by each, the number
and date of certificates issued for the shares, and the date of cancellation of
every certificate surrendered for cancellation; and (f) have such powers and
duties as may from time to time be prescribed by the Board of Directors or the
Chairman. [Amended by Board of Directors 8-29-90.]

            Section 3.07. The Vice President - Finance. If a Vice President -
                          ----------------------------
Finance is elected by the Board of Directors, he or she (a) shall serve as the
Company's Chief Financial Officer; (b) shall, subject to the approval of the
Chairman, recommend financing, investing, borrowing, tax, insurance and internal
audit policies for the Company; (c) shall be responsible for the preparation of
consolidated financial statements required by the


                                      -18-


Board of Directors or the Chairman; (d) shall see that the lists, books,
reports, statements, tax returns, certificates and other documents and records
required by law are properly prepared, completed and filed; and (e) shall have
such other powers and duties in such capacities as may from time to time be
prescribed by the Board of Directors or the Chairman. If the Board does not
elect a Vice President - Finance, the powers and duties herein set forth shall
be exercised by the Treasurer. [Amended by Board of Directors 8-29-90.]

            Section 3.08. The Treasurer. The Treasurer (a) shall have powers and
                          -------------
perform such duties in such capacities as may be assigned by the Board of
Directors or the Vice President - Finance in the development of financing,
investing and borrowing policies, and shall administer these policies; (b) shall
have charge and custody of and be responsible for the corporate funds,
securities and investments; (c) shall receive, endorse for collection, and give
receipts for checks notes, obligations, funds and securities of the Company, and
deposit monies and other valuable effects in the name and to the credit of the
Company in such depositories as shall be designated by the Board of Directors;
(d) subject to the provisions of Section 5.01 of the By-Laws, shall cause to be
disbursed the funds of the Company by payment in cash or by checks or drafts
upon the authorized depositories of the Company, and cause to be taken and
preserved proper vouchers and receipts for such disbursements; (e) shall
coordinate financing of the Company's international subsidiaries; and (f) shall
have such other powers and duties as may from time to time be prescribed by the
Board of Directors or the Vice President - Finance. [Amended by Board of
Directors 8-29-90.]

            Section 3.9. Delegation of Duties. In case of the absence of any
                         --------------------
officer of the Company, or for any other reason that the Board may deem
sufficient, the Board of Directors may delegate


                                      -19-


for the time being the powers and duties, or any of them, of any officer to any
other officer or director or other person whom it may select.

                                   ARTICLE IV

                             Shares of Capital Stock
                             -----------------------

            Section 4.01. Share Certificate. Every holder of fully-paid stock in
                          -----------------
the Company shall be entitled to a certificate or certificates, consecutively
numbered, to be in such form as the Board of Directors may from time to time
prescribe, and signed (in facsimile or otherwise, as permitted by law) by the
Chairman, the President or a Vice President and by the Secretary or the
Treasurer which shall represent and certify the number of shares of stock owned
by such holder. The Board may authorize the issuance of certificates for
fractional shares or, in lieu thereof, scrip or other evidence of ownership,
which may (or may not) as determined by the Board entitle the holder thereof to
voting, dividend or other rights of shareholders.

            Section 4.02. Transfer of Shares. Transfers of shares of stock of
                          ------------------
the Company shall be made on the books of the Company only upon surrender to the
Company for cancellation of the certificate or certificates for such shares
properly endorsed, by the registered shareholder or by his assignee, agent or
legal representative, who shall furnish proper evidence of succession,
assignment or authority to transfer, or by the agent of one or the fore-going
there unto duly authorized by an instrument duly executed and filed with the
Company in accordance with regular commercial practice.

            Section 4.03. Replacement of Certificates. New certificates for
                          ---------------------------
shares of stock may be issued to replace certificates alleged to have been lost,
stolen, destroyed or


                                      -20-


mutilated upon such terms and conditions, including an affidavit of loss or
destruction and the giving of a satisfactory bond of indemnity, as the Board of
Directors from time to time may determine.

            Section 4.04. Regulations Relating to Shares. The Board of Directors
                          ------------------------------
shall have power and authority to make all such rules and regulations not
inconsistent with these By-Laws as it may deem expedient concerning the issue,
transfer and registration of certificates representing shares of the Company.

            Section 4.05. Record Date. The Board of Directors may fix a record
                          -----------
date for the determination of shareholders for any purpose, including the right
to notice of or to vote at meetings, payment of dividends or distributions,
allotment of rights, or change, reclassification, conversion or exchange of
shares, up to 90 days prior to the action for which the record date is fixed.
The Company shall be entitled to treat the holder of record of any share or
shares of stock of the Company as the holder and owner in fact thereof for all
purposes and shall not be bound to recognize any equitable or other claim to or
right, title or interest in any share on the part of any other person, whether
or not it shall have express or other notice thereof, except as otherwise
expressly provided by the laws of Pennsylvania. [Amended by the Board of
Directors 3/13/01.]

                                    ARTICLE V

               Miscellaneous Corporate Transactions and Documents
               --------------------------------------------------

            Section 5.01. Borrowing. No officer, agent or employee of the
                          ---------
Company shall have any power or authority to borrow money on its behalf, to
guarantee or pledge its credit, or to mortgage or pledge any of its real or
personal property, except within the scope and to the extent of the authority
delegated by the Board of


                                      -21-


Directors. Authority may be granted by the Board for any of the above purposes
and may be general or limited to specific instances.

            Section 5.02. Execution of Instruments Generally. All properly
                          ----------------------------------
authorized notes, bonds, drafts, acceptances, checks, endorsements (other than
for deposit), guarantees, and all evidences of indebtedness of the Company
whatsoever, and all properly authorized deeds, mortgages, contracts and other
instruments requiring execution by the Company may be executed and delivered by
the Chairman, the President or any Vice President or the Treasurer of the
Company; and authority to sign any such contracts or instruments, which may be
general or confined to specific instances, may be conferred by the Board of
Directors upon any other person or persons, subject to such requirements as to
countersignature or other conditions, as the Board of Directors from time to
time may determine. Facsimile signature on checks, notes, bonds and other
instruments may be used if authorized by the Board of Directors. Any person
having authority to sign on behalf of the Company may delegate, from time to
time, by instrument in writing, all or any part of such authority to any person
or persons if authorized so to do by the Board of Directors.

            Section 5.03. Voting and Acting with Respect to Securities Owned by
                          -----------------------------------------------------
Company. The Chairman of the Board of Directors, the President or any Vice
- -------
President each shall have the power and authority to vote and act with respect
to all stock and other securities in any other corporation held by this Company,
unless the Board confers such authority, which may be general or specific, upon
some other person. Any person so authorized to vote securities shall have the
power to appoint an attorney or attorneys, with general power of substitution,
as proxies for the Company, with full power to vote and act in behalf of the
Company with respect to such stock and other securities.


                                      -22-


                                   ARTICLE VI

                               General Provisions
                               ------------------

            Section 6.01. Offices. The principal office and place of business of
                          -------
the Company shall be at 121 Gamma Drive, Pittsburgh, Allegheny County,
Pennsylvania. The Company may also have offices at such other places within or
without the Commonwealth of Pennsylvania as the business of the Company may
require.

            Section 6.02. Corporate Seal. The Board of Directors shall prescribe
                          --------------
the form of a suitable corporate seal, which shall contain the full name of the
Company and the year and state of incorporation.

            Section 6.03. Fiscal Year. The fiscal year of the Company shall
                          -----------
begin the first day of January and terminate on the last day of December in each
year.

            Section 6.04. Financial Reports to Shareholders. The Board of
                          ---------------------------------
Directors shall have discretion to determine whether financial statements shall
be sent to shareholders, what such reports shall contain, and whether they shall
be audited or accompanied by the report of an independent or certified public
accountant.

                                   ARTICLE VII

                                 Indemnification
                                 ---------------
                       [Approved by Shareholders 4/24/87.]

            Section 7.01.  Indemnification of Directors, Officers and Others.
                           -------------------------------------------------

            (a) Right to Indemnification. Except as prohibited by law, every
                ------------------------
Director and officer of the Company shall be entitled as


                                      -23-


of right to be indemnified by the Company against expenses and any liability
paid or incurred by such person in connection with any actual or threatened
claim, action, suit or proceeding, civil, criminal, administrative,
investigative or other, whether brought by or in the right of the Company or
otherwise, in which he or she may be involved, as a party or otherwise, by
reason of such person being or having been a Director or officer of the Company
or by reason of the fact that such person is or was serving at the request of
the Company as a director, officer, employee, fiduciary or other representative
of another corporation, partnership, joint venture, trust, employee benefit plan
or other entity (such claim, action, suit or proceeding hereinafter being
referred to as "Action"); provided that no such right or indemnification shall
exist with respect to an Action brought by an indemnitee (as hereinafter
defined) against the Company except as provided in the last sentence of this
Subsection (a). Persons who are not directors or officers of the Company may be
similarly indemnified in respect of service to the Company or to another such
entity at the request of the Company to the extent the Board of Directors at any
time denominates any of such persons as entitled to the benefits of this
Section. As used in this Section 7.01, "indemnitee" shall include each Director
and officer of the Company and each other person denominated by the Board of
Directors as entitled to the benefits of this Section, "expenses" shall include
fees and expenses of counsel selected by any such indemnitee and "liability"
shall include amounts of judgments, excise taxes, fines, penalties and amounts
paid in settlement. An indemnitee shall be entitled to be indemnified pursuant
to this Subsection (a) for expenses incurred in connection with any Action
brought by an indemnitee against the Company only (i) as provided under
Subsection (c) of this Section, (ii) if the indemnitee is successful in whole or
in part in the Action for which expenses are claimed or (iii) if the
indemnification for expenses is included in a settlement of the Action or is
awarded by a court.


                                      -24-


            (b) Right to Advancement of Expenses. Every indemnitee shall be
                --------------------------------
entitled as of right to have his or her expenses in defending any Action or in
any Action under Subsection (c) paid in advance by the Company prior to final
disposition of such Action, subject to any obligation which may be imposed by
law or by provision in the Articles, By-Laws, agreement or otherwise to
reimburse the Company in certain events.

            (c) Right of Indemnitee to Initiate Action. If a written claim under
                --------------------------------------
Subsection (a) or Subsection (b) of this Section is not paid in full by the
Company within thirty days after such claim has been received by the Company,
the indemnitee may at any time thereafter initiate an Action against the Company
to recover the unpaid amount of the claim and, if successful in whole or in
part, the indemnitee shall also be entitled to be paid the expense of
prosecuting such Action. The only defense to any Action to recover a claim under
Subsection (a) of this Section shall be that the indemnitee's conduct was such
that under Pennsylvania law the Company is prohibited from indemnifying the
indemnitee for the amount claimed, but the burden of proving such defense shall
be on the Company. Neither the failure of the Company (including its Board of
Directors, independent legal counsel and its shareholders) to have made a
determination prior to the commencement of such suit that indemnification of the
indemnitee is proper in the circumstances, nor an actual determination by the
Company (including its Board of Directors, independent legal counsel or its
shareholders) that the indemnitee's conduct was such that indemnification is
prohibited by law, shall be a defense to such Action or create a presumption
that the indemnitee's conduct was such that indemnification is prohibited by
law. The only defense to any such Action to receive payment of expenses in
advance under Subsection (b) of this Section shall be failure to make an


                                      -25-


undertaking to reimburse if such an undertaking is required by law or by
provision in the Articles, By-Laws, agreement or otherwise.

            (d) Insurance and Funding. The Company may purchase and maintain
                ---------------------
insurance to protect itself and any person eligible to be indemnified hereunder
against any liability or expense asserted or incurred by such person in
connection with any Action, whether or not the Company would have the power to
indemnify such person against such liability or expense by law or under the
provisions of this Section. The Company may create a trust fund, grant a
security interest, cause a letter of credit to be issued or use other means
(whether or not similar to the foregoing) to ensure the payment of such sums as
may become necessary to effect indemnification a provided herein.

            (e) Non-Exclusivity; Nature and Extent of Rights. The right of
                --------------------------------------------
indemnification and advancement of expenses provided for in this Section (i)
shall not be deemed exclusive of any other rights, whether now existing or
here-after created, to which any indemnitee may be entitled under any agreement
or by-law, charter provision, vote of share-holders or directors or otherwise
(ii) shall be deemed to create contractual rights in favor of each indemnitee,
(iii) shall continue as to each person who has ceased to have the status
pursuant to which he or she was entitled or was denominated as entitled to
indemnification under this Section and shall inure to the benefit of the heirs
and legal representatives of each indemnitee and (iv) shall be applicable to
Actions commenced after the adoption of this Section, whether arising from acts
or omissions occurring before or after the adoption of this Section. The rights
of indemnification and advancement of expenses provided for in this Section may
not be amended or repealed so as to limit in any way the indemnification or the
right to advancement of expenses provided for in this Section with respect to
any acts


                                      -26-


or omissions occurring prior to the adoption of any such amendment or repeal.

            (f) Effective Date. This Section 7.01 shall apply to every Action
                --------------
other than an Action filed prior to January 27, 1987, except that it shall not
apply to the extent that Pennsylvania law does not permit its application to any
breach of performance of duty or any failure of performance of duty by an
indemnitee occurring prior to January 27, 1987. [Approved by Shareholders
4/24/87.] [Restated Articles, Article 14th.]

            Section 7.02 Personal Liability of Directors.
                         -------------------------------

            (a) To the fullest extent that the laws of the Commonwealth of
Pennsylvania, as in effect on January 27, 1987 or as thereafter amended, permit
elimination or limitation of the liability of directors, no Director of the
Company shall be personally liable for monetary damages as such for any action
taken, or any failure to take any action, as a Director.

            (b) This Section 7.02 shall not apply to any actions filed prior to
January 27, 1987, nor to any breach of performance of duty or any failure of
performance of duty by any Director of the Company occurring prior to January
27, 1987. The provisions of this Section shall be deemed to be a contract with
each Director of the Company who serves as such at any time while this Section
is in effect and each such Director shall be deemed to be doing so in reliance
on the provisions of this Section. Any amendment or repeal of this Section or
adoption of any other By-Law or provision of the Articles of the Company which
has the effect of increasing Director liability shall operate prospectively only
and shall not affect any action taken, or any failure to act, prior to the
adoption of such amendment, repeal, other By-Law or provision.


                                      -27-


[Approved by Shareholders 4/24/87.] [Restated Articles, Article 14th.]

                                  ARTICLE VIII

                                   Amendments
                                   ----------

            Section 8.01. Amendments to By-Laws. The Board of Directors, by vote
                          ---------------------
of a majority of the Disinterested Directors, may adopt, amend and repeal the
By-Laws with respect to those matters which are not, by statute, reserved
exclusively to the shareholders. No By-Law may be adopted, amended or repealed
by the shareholders unless, in addition to any vote required by any other
provision of law, the Articles or the By-Laws of the Company, such action is
approved by the holders of a majority of the Voting Power of the Voting Stock of
the Company which is not Beneficially Owned by an Acquiring Person, unless such
action has been previously approved by a majority vote of the Disinterested
Directors. [Restated Articles Section 12.1]

                                   ARTICLE IX

                          Non-Applicability of Statute
                          ----------------------------

            Section 9.01. Non-Applicability of Statute. Subchapter 25G
                          ----------------------------
(Control-Share Acquisitions) of the Pennsylvania Business Corporation Law, added
by the Act of April 27, 1990 (P.L. 129, No. 36), shall not be applicable to the
Company. [This By-Law provision was adopted by action of the Board of Directors
on June 27, 1990.]


                                      -28-