SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 10-Q

               QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934


For the quarter ended September 30, 2001             Commission File No. 0-2504


                        MINE SAFETY APPLIANCES COMPANY

            (Exact name of registrant as specified in its charter)



                  Pennsylvania                     25-0668780

      (State or other jurisdiction of   (IRS Employer Identification No.)
      incorporation or organization)



           121 Gamma Drive
           RIDC Industrial Park
           O'Hara Township
           Pittsburgh, Pennsylvania                         15238

     (Address of principal executive offices)            (Zip Code)


Registrant's telephone number, including area code:  412/967-3000


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months and (2) has been subject to such filing requirements for
the past 90 days.


            Yes   X                              No


As of October 31, 2001, there were outstanding 13,490,335 shares of common stock
without par value, including 1,415,373 shares held by the Mine Safety Appliances
Company Stock Compensation Trust.


                         PART I  FINANCIAL INFORMATION
                        MINE SAFETY APPLIANCES COMPANY
                     CONSOLIDATED CONDENSED BALANCE SHEET
                   (Thousands of dollars, except share data)




                                                                                 September 30     December 31
                                                                                     2001            2000
                                                                                            
ASSETS
  Current assets
    Cash                                                                        $    18,830       $  19,408
    Temporary investments, at cost which approximates market                          6,544           7,133
    Trade receivables, less allowance for doubtful accounts
      $2,458 and $2,363                                                              54,176          47,055
    Other receivables                                                                40,094          30,498
    Inventories:
      Finished products                                                              32,859          30,743
      Work in process                                                                11,864          10,451
      Raw materials and supplies                                                     35,442          31,487
                                                                               ------------      ----------
          Total inventories                                                          80,165          72,681

    Deferred tax assets                                                              15,311          14,167
    Prepaid expenses and other current assets                                        10,168          10,211
                                                                               ------------      ----------
          Total current assets                                                      225,288         201,153

  Property, plant and equipment                                                     385,927         383,741
  Less accumulated depreciation                                                    (232,919)       (224,155)
                                                                               ------------      ----------
          Net property                                                              153,008         159,586

  Prepaid pension cost                                                               92,713          78,157
  Deferred tax assets                                                                 9,418          10,315
  Other noncurrent assets                                                            45,027          40,472
                                                                               ------------      ----------
          TOTAL                                                                 $   525,454       $ 489,683
                                                                               ============      ==========

LIABILITIES AND SHAREHOLDERS' EQUITY
  Current liabilities
    Notes payable and current portion of long-term debt                         $     7,169       $   6,616
    Accounts payable                                                                 33,361          32,387
    Employees' compensation                                                          15,931          13,202
    Insurance                                                                         9,225           8,476
    Taxes on income                                                                  10,965           2,263
    Other current liabilities                                                        26,986          24,034
                                                                               ------------      ----------
          Total current liabilities                                                 103,637          86,978
                                                                               ------------      ----------

  Long-term debt                                                                     71,392          71,806
  Pensions and other employee benefits                                               53,958          54,626
  Deferred tax liabilities                                                           47,655          47,151
  Other noncurrent liabilities                                                        2,932           2,657

  Shareholders' equity
    Preferred stock, 4-1/2% cumulative - authorized
      100,000 shares of $50 par value; issued 71,373
      shares, callable at $52.50 per share                                            3,569           3,569
    Second cumulative preferred voting stock - authorized
      1,000,000 shares of $10 par value;  none issued
    Common stock - authorized 60,000,000 shares of no par
      value; issued 20,355,681 and 20,335,797 (outstanding
      11,977,997 and 11,827,623)                                                     20,356          18,841
    Stock compensation trust - 1,419,373 and 1,639,320 shares                       (22,242)        (25,683)
    Less treasury shares, at cost:
      Preferred -    50,313 and    49,713 shares                                     (1,629)         (1,608)
      Common    - 6,958,311 and 6,868,854 shares                                   (131,933)       (129,066)
    Deferred stock compensation                                                        (772)         (1,145)
    Accumulated other comprehensive loss                                            (21,735)        (20,869)
    Earnings retained in the business                                               400,266         382,426
                                                                               ------------      ----------
          Total shareholders' equity                                                245,880         226,465
                                                                               ------------      ----------
          TOTAL                                                                 $   525,454       $ 489,683
                                                                               ============      ==========


See notes to consolidated condensed financial statements


                        MINE SAFETY APPLIANCES COMPANY
                  CONSOLIDATED CONDENSED STATEMENT OF INCOME
               (Thousands of dollars, except earnings per share)



                                                               Three Months Ended         Nine Months Ended
                                                                   September 30              September 30
                                                                  2001        2000          2001        2000
                                                                                        
Net sales                                                      $ 137,079    $ 119,745    $ 405,455   $ 370,664
Other income (expense)                                               930         (528)       1,423       1,390
                                                               ---------    ---------    ---------   ---------
                                                                 138,009      119,217      406,878     372,054
                                                               ---------    ---------    ---------   ---------
Costs and expenses
  Cost of products sold                                           83,939       76,869      247,384     234,096
  Selling, general and administrative                             32,811       29,618       97,817      95,607
  Depreciation and amortization                                    6,256        6,162       19,123      17,977
  Interest                                                         1,526        1,277        4,556       2,938
  Currency exchange losses (gains)                                   545          (73)         930        (266)
                                                               ---------    ---------    ---------   ---------
                                                                 125,077      113,853      369,810     350,352
                                                               ---------    ---------    ---------   ---------

Income before income taxes                                        12,932        5,364       37,068      21,702
Provision for income taxes                                         5,139        1,444       14,454       7,497
                                                               ---------    ---------    ---------   ---------
Net income                                                     $   7,793    $   3,920    $  22,614   $  14,205
                                                               =========    =========    =========   =========
Basic earnings per common share                                $    0.65    $    0.33    $    1.90   $    1.14
                                                               =========    =========    =========   =========
Diluted earnings per common share                              $    0.64    $    0.33    $    1.88   $    1.13
                                                               =========    =========    =========   =========
Dividends per common share                                     $    0.14    $    0.12    $    0.40   $    0.58
                                                               =========    =========    =========   =========


See notes to consolidated condensed financial statements


                        MINE SAFETY APPLIANCES COMPANY
                 CONSOLIDATED CONDENSED STATEMENT OF CASH FLOWS
                            (Thousands of dollars)


                                                                            Nine Months Ended
                                                                              September 30

                                                                           2001          2000
                                                                               
OPERATING ACTIVITIES
  Net income                                                            $ 22,614      $ 14,205
  Depreciation and amortization                                           19,123        17,977
  Pensions                                                               (13,116)      (12,486)
    Net gain on dispositions of property and businesses                   (1,984)       (1,575)
  Deferred income taxes                                                      255        (1,213)
    Changes in operating assets and liabilities                           (8,004)       21,861
    Other - including currency exchange adjustments                         (951)       (5,949)
                                                                        --------      --------
  Cash flow from operating activities                                     17,937        32,820

INVESTING ACTIVITIES
  Property additions                                                     (15,080)      (16,133)
  Dispositions of property and businesses                                  6,475         2,120
  Acquisitions and other investing                                        (7,045)      (25,162)
                                                                        --------      --------
  Cash flow from investing activities                                    (15,650)      (39,175)

FINANCING ACTIVITIES
  Changes in notes payable and short-term debt                               719           390
  Additions to long-term debt                                                  6        40,740
  Reductions of long-term debt                                              (484)         (267)
  Cash dividends                                                          (4,775)       (4,450)
  Company stock purchases                                                 (2,809)      (54,304)
  Company stock sales                                                      4,932        27,088
                                                                        --------      --------
  Cash flow from financing activities                                     (2,411)        9,197

Effect of exchange rate changes on cash                                   (1,043)         (869)
                                                                        --------      --------
(Decrease) increase in cash and cash equivalents                          (1,167)        1,973
Beginning cash and cash equivalents                                       26,541        17,108
                                                                        --------      --------
Ending cash and cash equivalents                                        $ 25,374      $ 19,081
                                                                        ========      ========


See notes to consolidated condensed financial statements


                        MINE SAFETY APPLIANCES COMPANY
             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS

(1)     The Management's Discussion and Analysis of Financial Condition and
        Results of Operations which follows these notes contains additional
        information on the results of operations and the financial position of
        the company. Those comments should be read in conjunction with these
        notes. The company's annual report on Form 10-K for the year ended
        December 31, 2000 includes additional information about the company, its
        operations, and its financial position, and should be read in
        conjunction with this quarterly report on Form 10-Q.

(2)     The results for the interim periods are not  necessarily  indicative of
        the results to be expected for the full year.

(3)     Certain prior year amounts have been reclassified to conform with the
        current year presentation.

(4)     In the opinion of management, all adjustments, consisting of only normal
        recurring adjustments, necessary for a fair presentation of these
        interim periods have been included.

(5)     Basic earnings per share is computed on the weighted average number of
        shares outstanding during the period. Diluted earnings per share
        includes the effect of the weighted average stock options outstanding
        during the period, using the treasury stock method. Antidilutive options
        are not considered in computing earnings per share.



                                                      Three Months Ended            Nine Months Ended
                                                         September 30                 September 30
                                                         2001       2000        2001            2000
                                                        ( In thousands)             ( In thousands)
                                                                                
        Net income                                     $ 7,793     $ 3,920     $ 22,614     $ 14,205
        Preferred stock dividends declared                  12          13           36           37
                                                       -------     -------     --------     --------
        Income available to common shareholders          7,781       3,907       22,578       14,168
                                                       -------     -------     --------     --------
        Basic shares outstanding                        11,883      11,900       11,853       12,457
        Stock options                                      246          46          167           50
                                                       -------     -------     --------     --------
        Diluted shares outstanding                      12,129      11,946       12,020       12,507
                                                       -------     -------     --------     --------
        Antidilutive stock options                           0          29            0           29
                                                       -------     -------     --------     --------


(6)     Comprehensive income was $9,956,000 and $21,748,000 for the three and
        nine months ended September 30, 2001, respectively, and $1,134,000 and
        $8,184,000 for the three and nine months ended September 30, 2000,
        respectively. Comprehensive income includes net income and changes in
        accumulated other comprehensive income, primarily cumulative translation
        adjustments, for the period.


(7)     The company is organized into three geographic operating segments (North
        America, Europe and Other International), each of which includes a
        number of operating companies.

        Reportable segment information is presented in the following table:



                                         (In Thousands)
                                             North                      Other       Reconciling     Consolidated
                                            America        Europe   International      items           totals
                                                                                     
Three Months Ended September 30, 2001
Sales to external customers                 $ 96,378      $ 22,036     $ 18,624      $     41         $ 137,079
Intercompany sales                             5,169         4,716          543       (10,428)
Net income                                     6,290           860          955          (312)            7,793

Nine Months Ended September 30, 2001
Sales to external customers                  280,679        69,453       55,226            97           405,455
Intercompany sales                            14,494        15,249        1,504       (31,247)
Net income                                    18,778         1,379        2,722          (265)           22,614

Three Months Ended September 30, 2000
Sales to external customers                   78,941        22,290       18,410           104           119,745
Intercompany sales                             5,412         4,140          417        (9,969)
Net income (loss)                              3,921          (806)         813            (8)            3,920

Nine Months Ended September 30, 2000
Sales to external customers                  242,183        73,884       54,412           185           370,664
Intercompany sales                            19,669        11,647        1,099       (32,415)
Net income (loss)                             13,639        (1,511)       2,122           (45)           14,205


        Reconciling items consist primarily of intercompany eliminations and
        items reported at the corporate level.

(8)     FAS No. 125, Accounting for Transfers and Servicing of Financial Assets
        and Extinguishment of Liabilities, applies a control-oriented, financial
        components approach to financial-asset- transfer transactions. Financial
        assets, net of retained interests, are removed from the balance sheet
        when the assets are sold and control is surrendered. In September 2000,
        FAS No. 125 was replaced by FAS 140 which revised certain accounting and
        disclosure requirements for securitizations and other transfers of
        financial assets, but carried over most FAS No. 125 provisions.

        At September 30, 2001, accounts receivable of $67.2 million were owned
        by Mine Safety Funding Corporation (MSF), an unconsolidated wholly-owned
        special purpose bankruptcy-remote subsidiary of the company. The company
        held a subordinated interest in these receivables of $41.1 million, of
        which $40.1 million is classified as other receivables. Net proceeds to
        the company from the securitization arrangement were $25.0 million at
        September 30, 2001.

        The key economic assumptions used to measure the retained interest at
        September 30, 2001 were a discount rate of 5.2% and an estimated life of
        2.6 months. At September 30, 2001, an adverse change in the discount
        rate or estimated life of 10% and 20% would reduce the fair value of the
        retained interest by $73,000 and $146,000, respectively. The effect of
        hypothetical changes in fair value based on variations in assumptions
        should be used with caution and generally cannot be extrapolated.
        Additionally, the effect on the fair value of the retained interest of
        changing a particular assumption has been calculated without changing
        other assumptions. In reality, a change in one factor may result in
        changes in others.


(9)     Effective January 1, 2001, the company adopted FAS No. 133, Accounting
        for Derivative Instruments and Hedging Activities, which establishes
        accounting and reporting standards for derivative instruments, including
        those embedded in other contracts. Adoption of this standard did not
        have a significant effect on the company's results or financial
        position.

(10)    The company will adopt FAS No. 142, Goodwill and Other Intangible
        Assets, effective January 1, 2002. Under FAS No. 142 goodwill and other
        intangible assets with indefinite lives are not amortized, but are
        subject to periodic impairment tests that must be performed at least
        annually. Adoption of this standard will reduce amortization expense
        beginning in 2002; however, impairment tests could result in future
        periodic write-downs. The company is reviewing the provisions of this
        statement and its impact on results of operations and financial
        position.

        FAS No. 143, Acccounting for Asset Retirement Obligations, and FAS No.
        144, Accounting for the Impairment or Disposal of Long-Lived Assets, are
        effective for the company on January 1, 2003 and January 1, 2002,
        respectively. The company is currently evaluating the provisions of
        these statements and their impact on results of operations and financial
        position.


MANAGEMENT'S DISCUSSION AND ANALYSIS


Forward-looking statements
--------------------------

This report contains "forward-looking statements" within the meaning of the
Private Securities Litigation Reform Act of 1995.  Such forward-looking
statements may include, without limitation, statements regarding expectations
for new products, cost reduction programs, fire department funding programs,
liquidity, sales and earnings, and market risk.  Actual results may differ from
expectations contained in such forward-looking statements and can be affected by
any number of factors, many of which are outside of management's direct control.
Among the factors that could cause such differences are market acceptance of new
products, the company's ability to fulfill order backlogs, fire service market
conditions, the effects of cost reduction efforts, the global economic
environment, and interest and currency exchange rates.

Results of operations
---------------------

Three months ended September 30, 2001 and 2000
----------------------------------------------

Sales for the third quarter of 2001 were $137.1 million, an increase of $17.4
million, or 14%, from $119.7 million in the third quarter of 2000.

Third quarter 2001 sales for North American operations were 22% higher than in
the third quarter of last year. Sales to the fire service market were
significantly higher than last year, reflecting continuing strength in shipments
of breathing apparatus and the introduction of the Evolution line of thermal
imaging cameras and the CairnsHelmets line of firefighter head protection during
the third quarter of 2000. Third quarter 2001 sales included substantial
shipments on an order for more than 1000 self-contained breathing apparatus for
the Chicago Fire Department. Current quarter sales also included higher
shipments of gas masks, breathing apparatus, and goggles to the U.S. government.
Shipments of air-purifying respirators to distributors serving the three
September 11th disaster sites increased significantly to support rescue and
recovery efforts. Specialty chemical sales in the third quarter of 2001 were 17%
lower than last year's third quarter.

Shipments of safety products exceeded incoming orders in third quarter 2001,
resulting in lower backlog. Management believes that certain fire service orders
in the U.S. were delayed during the second and third quarters until the
recipients of funding granted to U.S. fire departments under the Federal
Emergency Management Agency (FEMA) Assistance to Firefighters Program were
announced. It is expected that the announcement of these awards will lead to
increased fire service orders over time. However, in the short-term, the
September 11th tragedy has resulted in changes in the mix of safety product
orders as some local governments are diverting regular fire service



funding to other priorities, while disaster recovery efforts and defense
preparedness concerns have increased demand for air-purifying respirators, gas
masks, and other personal protective equipment. The longer-term effects of these
events on safety product orders remains to be seen. Specialty chemical order
backlog increased modestly during the current quarter.

Third quarter 2001 sales to external customers by international operations were
unchanged compared to third quarter 2000, with a 1% decrease in European sales
being offset by a 1% increase in other international sales.  Local currency
sales of other international companies grew approximately 15%, but these gains
were offset by currency exchange rate effects when stated in U.S. dollars.
Exchange rate effects in Europe were minor during the quarter.

Gross profit for the third quarter of 2001 was $53.1 million, an increase of
$10.2 million, or 24%, from $42.9 million in third quarter 2000.  The ratio of
gross profit to sales was 38.8% in the third quarter of 2001 compared to 35.8%
in the corresponding quarter last year.  The improved gross profit percentage
reflects reductions in manufacturing costs.

Selling and administration costs in the third quarter of 2001 were $32.8
million, an increase of $3.2 million, or 11%, from $29.6 million in the third
quarter of 2000.  The increase occurred primarily in North America and reflects
higher selling expenses associated with increased sales.  Additionally, third
quarter 2000 selling and administrative expenses were reduced by a pension
settlement gain of $1.3 million.

Depreciation and amortization expense in third quarter 2001 was $6.3 million, an
increase of 2% over $6.2 million in the corresponding quarter last year.  The
increase is primarily due to goodwill amortization associated with acquisitions
made in 2000 and early 2001.

Interest expense was $1.5 million in third quarter 2001 compared to $1.3 million
in third quarter 2000.  Higher interest expense in the current quarter reflects
additional debt required for the August 2000 acquisition of CairnsHelmets.

Other income was $930,000 for third quarter 2001 compared to an expense of
$528,000 in third quarter 2000.  Other income for third quarter 2001 included a
gain of $1.3 million on the sale of property in Britain.

Income before income taxes was $12.9 million for third quarter 2001 compared to
$5.4 million in third quarter 2000.

The effective income tax rate for the third quarter of 2001 was 39.7% compared
to 26.9% in third quarter 2000.  The lower effective rate in 2000 was related to
tax benefits on international operating losses, primarily in Germany, and
adjustments in the U.S. related to prior year foreign sales corporation tax
benefits.



Net income in the third quarter of 2001 was $7.8 million, or 65 cents per basic
share, compared to $3.9 million, or 33 cents per basic share, in the third
quarter last year.

Nine months ended September 30, 2001 and 2000
---------------------------------------------

Sales for the nine months ended September 30, 2001 were $405.5 million, an
increase of $34.8 million, or 9%, from $370.7 million last year.

North American sales for the first nine months of 2001 were 16% higher than the
same period last year. Shipments of breathing apparatus, thermal imaging cameras
and helmets to the fire service market; gas masks and goggles to defense and
civilian preparedness markets; and helmets for construction and industrial
markets all improved significantly in 2001. In September 2001, significant
shipments of air-purifying respirators were made to the September 11th disaster
sites. Instrument sales were also higher in 2001, reflecting new product
introductions. Sales of specialty chemicals were 7% higher than in the first
nine months of 2000. The increase in specialty chemical sales reflects gains in
the first and second quarters, partially offset by lower sales in the third
quarter.

Incoming orders for safety products exceeded sales during the first nine months
of 2001, particularly in U.S. government markets, resulting in a higher backlog.
Specialty chemical order backlog decreased modestly during the same period.

Sales in Europe for the first nine months of 2001 were 6% lower than during the
same period in 2000.  Modest local currency sales growth was more than offset by
currency exchange rate movements when stated in U.S. dollars.  The local
currency sales improvement occurred primarily in Germany.

Local currency sales of other international operations for the first nine months
of 2001 were approximately 15% higher than in the same period last year.  When
stated in U.S. dollars, however, other international sales increased only 1% due
to negative currency exchange rate movements.  Local currency sales were higher
in all geographic markets, particularly Australia and Brazil.

Gross profit for the nine months ended September 30, 2001 was $158.1 million, an
increase of $21.5 million, or 16%, from $136.6 million in the first nine months
of 2000.  The ratio of gross profit to sales was 39.0% in the nine months ended
September 30, 2001 compared to 36.8% in the corresponding period last year.  The
higher gross profit percentage reflects manufacturing cost reductions.

Selling, general and administration costs in the nine months ended September 30,
2001 were $97.8 million, an increase of $2.2 million, or 2%, from $95.6 million
in the same period last year.  The increase occurred mainly in North America and
includes higher selling expenses associated with sales increases.

Depreciation and amortization expense was $19.1 million in the nine months ended
September 30, 2001 an increase of $1.1 million, or 6%, from $18.0 million in the
same



period last year. The increase is primarily due to depreciation and goodwill
amortization associated with acquisitions made during 2000 and early 2001.

Interest expense for the nine months ended September 30, 2001 was $4.6 million,
an increase of $1.7 million, or 59%, from $2.9 million in the same period last
year.  Higher interest expense in 2001 relates to mid-2000 borrowings to finance
acquisitions and stock repurchases.

Other income was $1.4 million for both the nine months ended September 30, 2001
and the same period in 2000.  Other income included interest and rent income
totaling approximately $1.5 million in both years and net losses of
approximately $350,000 on the sales of property and trade accounts receivables
in both years.

Income before income taxes was $37.1 million for the nine months ended September
30, 2001 compared to $21.7 million in the first nine months of 2000, an increase
of $15.4 million, or 71%.

The effective income tax rate for the nine months ended September 30, 2001 was
39.0% compared to 34.5% in the same period last year.  The lower effective rate
in 2000 was due to tax benefits on international operating losses, primarily in
Germany, and adjustments in the U.S. related to prior year foreign sales
corporation tax benefits.

Net income in the nine months ended September 30, 2001 was $22.6 million, or
$1.90 per basic share, compared to $14.2 million, or $1.14 per basic share, in
the first nine months of 2000.

Liquidity and Financial Condition
---------------------------------

Cash and cash equivalents decreased $1.2 million during the first nine months of
2001 compared with an increase of $2.0 million in the first nine months of 2000.

Operating activities provided $17.9 million of cash in first nine months of 2001
compared to providing $32.8 million in the same period last year.  Lower cash
provided by operations in 2001 is related to changes in working capital,
primarily increases in receivables and inventory, partially offset by higher
income.  During the first nine months of 2000, inventory and receivables
decreased significantly.

Investing activities used $15.7 million of cash in the first nine months of 2001
compared to using $39.2 million in 2000.  The higher use of cash in 2000 was
primarily related to the acquisition of CairnsHelmets in August 2000.

Financing activities used cash of $2.4 million in the first nine months of 2001
and provided $9.2 million in the same period last year.  Financing activities in
2000 included $40 million provided from issuance of private placement bonds,
partially offset by net purchases of common stock from the family of a co-
founder.



Available credit facilities and internal cash resources are considered adequate
to provide for future operations, capital requirements and dividends to
shareholders.

Financial Instrument Market Risk
--------------------------------

There have been no material changes in the company's financial instrument market
risk during the first nine months of 2001.  For additional information, refer to
page 17 of the company's Annual Report to Shareholders for the year ended
December 31, 2000.



                          PART II  OTHER INFORMATION
                        MINE SAFETY APPLIANCES COMPANY



Item 1.  Legal Proceedings

            Not Applicable

Item 6.  Exhibits and Reports on Form 8-K

                  (a)Exhibits - None

                  (b)Reports on Form 8-K

No reports on Form 8-K were filed during the quarter ended September 30, 2001.

                                  SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                        MINE SAFETY APPLIANCES COMPANY



Date: November 2, 2001             By     /s/ Dennis L. Zeitler
                                          Dennis L. Zeitler
                                          Vice President - Finance;
                                          Principal Financial Officer