EXHIBIT 3.12

                                     BYLAWS

                                       OF

                       NICKERSON MACHINERY, CHICAGO INC.

                              ADOPTED FEB 8, 1994



                                     BYLAWS
                                       OF

                                   ARTICLE I
                                    OFFICES

      The principal office of the Corporation in the State of ILLINOIS shall be
located in DUPAGE, County of ILLINOIS. The Corporation may have such other
offices, either within or without the State of ILLINOIS, as the Board of
Directors may designate or as the business of the Corporation may require from
time to time.

                                   ARTICLE II
                                  SHAREHOLDERS

      SECTION 1. Annual Meeting. The annual meeting of the shareholders shall be
held on the 8th day in the month of FEB in each year, beginning with the year
1994, at the hour of 10 o'clock a.m., for the purpose of electing Directors and
for the transaction of such other business as may come before the meeting. If
the day fixed for the annual meeting shall be a legal holiday in the State of
ILLINOIS, such meeting shall be held on the next succeeding business day. If the
election of Directors shall not be held on the day designated herein for any
annual meeting of the shareholders, or at any adjournment thereof, the Board of
Directors shall cause the election to be held at a special meeting of the
shareholders as soon thereafter as conveniently may be.

      SECTION 2. Special Meetings. Special meetings of the shareholders, for any
purpose or purposes, unless otherwise prescribed by statute, may be called by
the President or by the Board of Directors, and shall be called by the President
at the request of the holders of not less than 70 percent (70%) of all the
outstanding shares of the Corporation entitled to vote at the meeting.

      SECTION 3. Place of Meeting. The Board of Directors may designate any
place, either within or without the State of IL, unless otherwise prescribed by
statute, as the place of meeting for any annual meeting or for any special
meeting. A waiver of notice signed by all shareholders entitled to vote at a
meeting may designate any place, either within or without the State of IL,
unless otherwise prescribed by statute, as the place for the holding of such
meeting. If no designation is made, the place of meeting shall be the principal
office of the Corporation.



      SECTION 4. Notice of Meeting. Written notice stating the place, day and
hour of the meeting and, in case of a special meeting, the purpose or purposes
for which the meeting is called, shall unless otherwise prescribed by statute,
be delivered not less than (2) two nor more than (5) five days before the date
of the meeting, to each shareholder of record entitled to vote at such meeting.
If mailed, such notice shall be deemed to be delivered when deposited in the
United States Mail, addressed to the shareholder at his address as it appears on
the stock transfer books of the Corporation, with postage thereon prepaid.

      SECTION 5. Closing of Transfer Books or Fixing of Record. For the purpose
of determining shareholders entitled to notice of or to vote at any meeting of
shareholders or any adjournment thereof, or shareholders entitled to receive
payment of any dividend, or in order to make a determination of shareholders for
any other proper purpose, the Board of Directors of the Corporation may provide
that the stock transfer books shall be closed for a stated period, but not to
exceed in any case fifty (50) days. If the stock transfer books shall be closed
for the purpose of determining shareholders entitled to notice of or to vote at
a meeting of share-holders, such books shall be closed for at least (2) two days
immediately preceding such meeting. In lieu of closing the stock transfer books,
the Board of Directors may fix in advance a date as the record date for any such
determination of shareholders, such date in any case to be not more than (2) two
days and, in case of a meeting of shareholders, not less than (2) two days,
prior to the date on which the particular action requiring such determination of
shareholders is to be taken. If the stock transfer books are not closed and no
record date is fixed for the determination of shareholders entitled to notice of
or to vote at a meeting of shareholders, or shareholders entitled to receive
payment of a dividend, the date on which notice of the meeting is mailed or the
date on which the resolution of the Board of Directors declaring such dividend
is adopted, as the case may be, shall be the record date for such determination
of shareholders. When a determination of shareholders entitled to vote at any
meeting of shareholders has been made as provided in this section, such
determination shall apply to any adjournment thereof.

      SECTION 6. Voting Lists. The officer or agent having charge of the stock
transfer books for shares of the corporation shall make a complete list of the
shareholders entitled to vote at each meeting of shareholders or any adjournment
thereof, arranged in alphabetical order, with the address of and the number of
shares held by each. Such list shall be produced and kept open at the time and
place of the meeting and shall be subject to the inspection of any shareholder
during the whole time of the meeting for the purposes thereof.

      SECTION 7. Quorum. A majority of the outstanding shares of the Corporation
entitled to vote, represented in person or by proxy, shall constitute a quorum
at a meeting of shareholders. If less than a majority of the outstanding shares
are represented at a meeting, a majority of the shares so represented may
adjourn the meeting from time to time without further notice. At such adjourned
meeting at which a quorum shall be present or represented,




any business may be transacted which might have been transacted at the meeting
as originally noticed. The shareholders present at a duly organized meeting may
continue to transact business until adjournment, notwithstanding the withdrawal
of enough shareholders to leave less than a quorum.

      SECTION 8. Proxies. At all meetings of shareholders, a shareholder may
vote in person or by proxy executed in writing by the shareholder or by his duly
authorized attorney-in-fact. Such proxy shall be filed with the secretary of the
Corporation before or at the time of the meeting. A meeting of the Board of
Directors may be had by means of a telephone conference or similar
communications equipment by which all persons participating in the meeting can
hear each other, and participation in a meeting under such circumstances shall
constitute presence at the meeting.

      SECTION 9. Voting of Shares. Each outstanding share entitled to vote shall
be entitled to one vote upon each matter submitted to a vote at a meeting of
shareholders.

      SECTION 10. Voting of Shares by Certain Holders. Shares standing in the
name of another corporation may be voted by such officer, agent or proxy as the
Bylaws of such corporation may prescribe or, in the absence of such provision,
as the Board of Directors of such corporation may determine.

      Shares held by an administrator, executor, guardian or conservator may be
voted by him, either in person or by proxy, without a transfer of such shares
into his name. Shares standing in the name of a trustee may be voted by him,
either in person or by proxy, but no trustee shall be entitled to vote shares
held by him without a transfer of such shares into his name.

      Shares standing in the name of a receiver may be voted by such receiver,
and shares held by or under the control of a receiver may be voted by such
receiver without the transfer thereof into his name, if authority so to do be
contained in an appropriate order of the court by which such receiver was
appointed.

      A shareholder whose shares are pledged shall be entitled to vote such
shares until the shares have been transferred into the name of the pledgee, and
thereafter the pledgee shall be entitled to vote the shares so transferred.

      Shares of its own stock belonging to the Corporation shall not be voted,
directly or indirectly, at any meeting, and shall not be counted in determining
the total number of outstanding shares at any given time.

      SECTION 11. Informal Action by Shareholders. Unless otherwise provided by
law, any action required to be taken at a meeting of the shareholders, or any
other action which may be taken at a meeting of the shareholders, may be taken
without a meeting if a consent in writing, setting forth the action so taken,
shall be signed by all of the shareholders entitled to vote with respect to the
subject matter thereof.




                                   ARTICLE III
                               BOARD OF DIRECTORS

      SECTION 1. General Powers. The business and affairs of the Corporation
shall be managed by its Board of Directors.

      SECTION 2. Number, Tenure and Qualifications. The number of directors of
the Corporation shall be fixed by the Board of Directors, but in no event shall
be less than (2). Each director shall hold office until the next annual meeting
of shareholders and until his successor shall have been elected and qualified.

      SECTION 3. Regular Meetings. A regular meeting of the Board of Directors
shall be held without other notice than this By-Law immediately after, and at
the same place as, the annual meeting of shareholders. The Board of Directors
may provide, by resolution, the time and place for the holding of additional
regular meetings without notice other than such resolution.

      SECTION 4. Special Meetings. Special meetings of the Board of Directors
may be called by or at the request of the President or any two directors. The
person or persons authorized to call special meetings of the Board of Directors
may fix the place for holding any special meeting of the Board of Directors
called by them.

      SECTION 5. Notice. Notice of any special meeting shall be given at least
one (1) day previous thereto by written notice delivered personally or mailed to
each director at his business address, or by telegram. If mailed, such notice
shall be deemed to be delivered when deposited in the United States Mail so
addressed, with postage thereon prepaid. If notice be given by telegram, such
notice shall be deemed to be delivered when the telegram is delivered to the
telegraph company. Any directors may waive notice of any meeting. The attendance
of a director at a meeting shall constitute a waiver of notice of such meeting,
except where a director attends a meeting for the express purpose of objecting
to the transaction of any business because the meeting is not lawfully called or
convened.

      SECTION 6. Quorum. A majority of the number of directors fixed by Section
2 of this Article III shall constitute a quorum for the transaction of business
at any meeting of the Board of Directors, but if less than such majority is
present at a meeting, a majority of the directors present may adjourn the
meeting from time to time without further notice.

      SECTION 7. Manner of Acting. The act of the majority of the directors
present at a meeting at which a quorum is present shall be the act of the Board
of Directors.

      SECTION 8. Action Without a Meeting. Any action that may be taken by the
Board of Directors at a meeting may be taken without a meeting if a consent



in writing, setting forth the action so to be taken, shall be signed before such
action by all of the directors.

      SECTION 9. Vacancies. Any vacancy occurring in the Board of Directors may
be filled by the affirmative vote of a majority of the remaining directors
though less than a quorum of the Board of Directors, unless otherwise provided
by law. A director elected to fill a vacancy shall be elected for the unexpired
term of his predecessor in office. Any directorship to be filled by reason of an
increase in the number of directors may be filled by election by the Board of
Directors for a term of office continuing only until the next election of
directors by the shareholders.

      SECTION 10. Compensation. By resolution of the Board of Directors, each
director may be paid his expenses, if any, of attendance at each meeting of the
Board of Directors, and may be paid a stated salary as director or a fixed sum
for attendance at each meeting of the Board of Directors or both. No such
payment shall preclude any director from serving the Corporation in any other
capacity and receiving compensation therefor.

      SECTION 11. Presumption of Assent. A director of the Corporation who is
present at a meeting of the Board of Directors at which action on any corporate
matter is taken shall be presumed to have assented to the action taken unless
his dissent shall be entered in the minutes of the meeting or unless he shall
file his written dissent to such action with the person acting as the Secretary
of the meeting before the adjournment thereof, or shall forward such dissent by
registered mail to the Secretary of the Corporation immediately after the
adjournment of the meeting. Such right to dissent shall not apply to a director
who voted in favor of such action.

                                   ARTICLE IV
                                    OFFICERS

      SECTION 1. Number. The officers of the Corporation shall be a President,
one or more Vice Presidents, a Secretary and a Treasurer, each of whom shall be
elected by the Board of Directors. Such other officers and assistant officers as
may be deemed necessary may be elected or appointed by the Board of Directors,
including a Chairman of the Board. In its discretion, the Board of Directors may
leave unfilled for any such period as it may determine any office except those
of President and Secretary. Any two or more offices may be held by the same
person, except for the offices of President and Secretary which may not be held
by the same person. Officers may be directors or shareholders of the
Corporation.

      SECTION 2. Election and Term of Office. The officers of the Corporation to
be elected by the Board of Directors shall be elected annually by the Board of
Directors at the first meeting of the Board of Directors held after each annual
meeting of the shareholders. If the election of officers shall not be held at
such meeting, such election shall be held as soon thereafter as



conveniently may be. Each officer shall hold office until his successor shall
have been duly elected and shall have qualified, or until his death, or until he
shall resign or shall have been removed in the manner hereinafter provided.

      SECTION 3. Removal. Any officer or agent may be removed by the Board of
Directors whenever, in its judgement, the best interests of the Corporation will
be served thereby, but such removal shall be without prejudice to the contract
rights, if any, of the person so removed. Election or appointment of an officer
or agent shall not of itself create contract rights, and such appointment shall
be terminable at will.

      SECTION 4. Vacancies. A vacancy in any office because of death,
resignation, removal, disqualification or otherwise, may be filled by the Board
of Directors for the unexpired portion of the term.

      SECTION 5. President. The President shall be the principal executive
officer of the Corporation and, subject to the control of the Board of
Directors, shall in general supervise and control all of the business and
affairs of the Corporation. He shall, when present, preside at all meetings of
the shareholders and of the Board of Directors, unless there is a Chairman of
the Board, in which case the Chairman shall preside. He may sign, with the
Secretary or any other proper officer of the Corporation thereunto authorized by
the Board of Directors, certificates for shares of the Corporation, any deeds,
mortgages, bonds, contracts, or other instruments which the Board of Directors
has authorized to be executed, except in cases where the signing and execution
thereof shall be expressly delegated by the Board of Directors or by these
Bylaws to some other officer or agent of the Corporation, or shall be required
by law to be otherwise signed or executed; and in general shall perform all
duties incident to the office of President and such other duties as may be
prescribed by the Board of Directors from time to time.

      SECTION 6. Vice President. In the absence of the President or in event of
his death, inability or refusal to act, the Vice President shall perform the
duties of the President, and when so acting, shall have all the powers of and be
subject to all the restrictions upon the President. The Vice President shall
perform such other duties as from time to time may be assigned to him by the
President or by the Board of Directors. If there is more than one Vice
President, each Vice President shall succeed to the duties of the President in
order of rank as determined by the Board of Directors. If no such rank has been
determined, then each Vice President shall succeed to the duties of the
President in order of date of election, the earliest date having the first rank.

      SECTION 7. Secretary. The Secretary shall: (a) keep the minutes of the
proceedings of the shareholders and of the Board of Directors in one or more
minute books provided for that purpose; (b) see that all notices are duly given
in accordance with the provisions of these Bylaws or as required by law; (c) be
custodian of the corporate records and of the seal of the Corporation and see
that the seal of the Corporation is affixed to all documents, the execution of
which on behalf of the Corporation under its seal is duly authorized; (d) keep a




register of the post office address of each shareholder which shall be furnished
to the Secretary by such shareholder; (e) sign with the President certificates
for shares of the Corporation, the issuance of which shall have been authorized
by resolution of the Board of Directors; (f) have general charge of the stock
transfer books of the Corporation; and (g) in general perform all duties
incident to the office of the Secretary and such other duties as from time to
time may be assigned to him by the President or by the Board of Directors.

      SECTION 8. Treasurer. The Treasurer shall: (a) have charge and custody of
and be responsible for all funds and securities of the Corporation; (b) receive
and give receipts for moneys due and payable to the Corporation from any source
what-soever, and deposit all such moneys in the name of the Corporation in such
banks, trust companies or other depositories as shall be selected in accordance
with the provisions of Article VI of these Bylaws; and (c) in general perform
all of the duties incident to the office of Treasurer and such other duties as
from time to time may be assigned to him by the President or by the Board of
Directors. If required by the Board of Directors, the Treasurer shall give a
bond for the faithful discharge of his duties in such sum and with such sureties
as the Board of Directors shall determine.

      SECTION 9. Salaries. The salaries of the officers shall be fixed from time
to time by the Board of Directors, and no officer shall be prevented from
receiving such salary by reason of the fact that he is also a director of the
Corporation.

                                    ARTICLE V
                                    INDEMNITY

      The Corporation shall indemnify its directors, officers and employees as
follows:

      (a) Every director, officer, or employee of the Corporation shall be
      indemnified by the Corporation against all expenses and liabilities,
      including counsel fees, reasonably incurred by or imposed upon him in
      connection with any proceeding to which he may be made a party, or in
      which he may become involved, by reason of his being or having been a
      director, officer, employee or agent of the Corporation or is or was
      serving at the request of the Corporation as a director, officer, employee
      or agent of the corporation, partnership, joint venture, trust or
      enterprise, or any settlement thereof, whether or not he is a director,
      officer, employee or agent at the time such expenses are incurred, except
      in such cases wherein the director, officer, or employee is adjudged
      guilty of willful misfeasance or malfeasance in the performance of his
      duties; provided that in the event of a settlement the indemnification
      herein shall apply only when the Board of Directors approves such
      settlement and reimbursement as being for the best interests of the
      Corporation.



      (b) The Corporation shall provide to any person who is or was a director,
      officer, employee, or agent of the Corporation or is or was serving at the
      request of the Corporation as a director, officer, employee or agent of
      the corporation, partnership, joint venture, trust or enterprise, the
      indemnity against expenses of suit, litigation or other proceedings which
      is specifically permissible under applicable law.

      (c) The Board of Directors may, in its discretion, direct the purchase of
      liability insurance by way of implementing the provisions of this Article
      V.

                                   ARTICLE VI
                      CONTRACTS, LOANS, CHECKS AND DEPOSITS

      SECTION 1. Contracts. The Board of Directors may authorize any officer or
officers, agent or agents, to enter into any contract or execute and deliver any
instrument in the name of and on behalf of the Corporation, and such authority
may be general or confined to specific instances.

      SECTION 2. Loans. No loans shall be contracted on behalf of the
Corporation and no evidences of indebtedness shall be issued in its name unless
authorized by a resolution of the Board of Directors. Such authority may be
general or confined to specific instances.

      SECTION 3. Checks, Drafts, etc. All checks, drafts or other orders for the
payment of money, notes or other evidences of indebtedness issued in the name of
the Corporation, shall be signed by such officer or officers, agent or agents of
the Corporation and in such manner as shall from time to time be determined by
resolution of the Board of Directors.

      SECTION 4. Deposits. All funds of the Corporation not otherwise employed
shall be deposited from time to time to the credit of the Corporation in such
banks, trust companies or other depositories as the Board of Directors may
select.

                                   ARTICLE VII
                   CERTIFICATES FOR SHARES AND THEIR TRANSFER

      SECTION 1. Certificates for Shares. Certificates representing shares of
the Corporation shall be in such form as shall be determined by the Board of
Directors. Such certificates shall be signed by the President and by the
Secretary or by such other officers authorized by law and by the Board of
Directors so to do, and sealed with the corporate seal. All certificates for
shares shall be consecutively numbered or otherwise identified. The name and
address of the person to whom the shares represented thereby are issued, with
the number of shares and date of issue, shall be entered on the stock transfer
books of the Corporation. All certificates surrendered to the Corporation for




transfer shall be cancelled and no new certificate shall be issued until the
former certificate for a like number of shares shall have been surrendered and
cancelled, except that in case of a lost, destroyed or mutilated certificate, a
new one may be issued therefor upon such terms and indemnity to the Corporation
as the Board of Directors may prescribe.

      SECTION 2. Transfer of Shares. Transfer of shares of the Corporation shall
be made only on the stock transfer books of the Corporation by the holder of
record thereof or by his legal representative, who shall furnish proper evidence
of authority to transfer, or by his attorney thereunto authorized by power of
attorney duly executed and filed with the Secretary of the Corporation, and on
surrender for cancellation of the certificate for such shares. The person in
whose name shares stand on the books of the Corporation shall be deemed by the
Corporation to be the owner thereof for all purposes. Provided, however, that
upon any action undertaken by the shareholders to elect S Corporation status
pursuant to Section 1362 of the Internal Revenue Code and upon any shareholders
agreement thereto restricting the transfer of said shares so as to disqualify
said S Corporation status, said restriction on transfer shall be made a part of
the bylaws so long as said agreement is in force and effect.

                                  ARTICLE VIII
                                   FISCAL YEAR

      The fiscal year of the Corporation shall begin on the 1st day of
JANUARY and end on the 31st day of DECEMBER of each year.

                                   ARTICLE IX
                                    DIVIDENDS

      The Board of Directors may from time to time declare, and the Corporation
may pay, dividends on its outstanding shares in the manner and upon the terms
and conditions provided by law and its Articles of Incorporation.

                                    ARTICLE X
                                 CORPORATE SEAL

      The Board of Directors shall provide a corporate seal which shall be
circular in form and shall have inscribed thereon the name of the Corporation
and the state of incorporation and the words, "Corporate Seal".

                                   ARTICLE XI
                                WAIVER OF NOTICE

      Unless otherwise provided by law, whenever any notice is required to be
given to any shareholder or director of the Corporation under the provisions




of these Bylaws or under the provisions of the Articles of Incorporation or
under the provisions of the applicable Business Corporation Act, a waiver
thereof in writing, signed by the person or persons entitled to such notice,
whether before or after the time stated therein, shall be deemed equivalent to
the giving of such notice.

                                   ARTICLE XII
                                   AMENDMENTS

      These Bylaws may be altered, amended or repealed and new Bylaws may be
adopted by the Board of Directors at any regular or special meeting of the Board
of Directors.

      The above Bylaws are certified to have been adopted by the Board of
Directors of the Corporation on the 8th day of FEBRUARY, 1994

                                                             /s/ Peggy Leichman
                                                             ------------------
                                                             Secretary