<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                  Schedule 13G
                   Under the Securities Exchange Act of 1934
                                Amendment No. 10


                         Mine Safety Appliances Company                         
______________________________________________________________________________
                                (Name of Issuer)

                                 Common Stock
______________________________________________________________________________
                         (Title of Class of Securities)

                                  602720104
______________________________________________________________________________
                                 (CUSIP Number)

Check the following box if a fee is being paid with this statement
CUSIP No.

    1)   Names of Reporting Persons S.S. or I.R.S. Identification Nos. of above
         persons
           PNC Bank Corp.   25-143-5979


    2)   Check the Appropriate Box if a Member of a Group (See Instructions)
         a) 
         b)

    3)   SEC USE ONLY


    4)   Citizenship or Place of Organization Pennsylvania


  Number of Shares             5) Sole Voting Power                      86,375
  Beneficially Owned     
  By Each Reporting
  Person With                  6) Shared Voting Power                   638,478 


                               7) Sole Dispositive Power                371,676

                             
                               8) Shared Dispositive Power              337,874 
                                                             


    9)  Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                        724,853


   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)


   11) Percent of Class Represented by Amount in Row (9)                  11.93


   12) Type of Reporting Person (See Instructions)                          HC





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                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                  Schedule 13G
                   Under the Securities Exchange Act of 1934
                                Amendment No. 10


                         Mine Safety Appliances Company
______________________________________________________________________________
                                (Name of Issuer)

                                 Common Stock
______________________________________________________________________________
                         (Title of Class of Securities)

                                  602720104
______________________________________________________________________________
                                 (CUSIP Number)

Check the following box if a fee is being paid with this statement
CUSIP No.

    1)   Names of Reporting Persons S.S. or I.R.S. Identification Nos. of
         above persons PNC Bank, National Association


    2)   Check the Appropriate Box if a Member of a Group (See Instructions)
         a)
         b)

    3)   SEC USE ONLY


    4)  Citizenship or Place of Organization  Pennsylvania


   Number of Shares         5) Sole Voting Power                         83,375
   Beneficially Owned
   By Each Reporting
   Person With              6) Shared Voting Power                      638,478


                            7) Sole Dispositive Power                   371,676


                            8) Shared Dispositive Power                 336,874


    9)  Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                        723,853


   10)   Check if the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)


    11) Percent of Class Represented by Amount in Row (9)                 11.92

    12) Type of Reporting Person (See Instructions)                          BK






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   Item 4 - Ownership:
      (a) Amount Beneficially Owned:
                                                                        724,853


      (b) Percent of Class:
                                                                          11.93


      (c) Number of shares to which such person has:
          (i) sole power to vote or to direct the vote                   86,375
          (ii) shared power to vote or to direct the vote               638,478
          (iii) sole power to dispose or to direct the disposition of   371,676
          (iv) shared power to dispose or to direct the disposition of  337,874



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         Item 10 - Certification.

            By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were acquired in the ordinary
         course of business and were not acquired for the purpose of and do not
         have the effect of changing or influencing the control of the issuer
         of such securities and were not acquired in connection with or as a
         participant in any transaction having such purposes or effect.



         Signature.

            After reasonable inquiry and to the best of my knowledge and
         belief, I certify that the information set forth in this statement is
         true, complete and correct.



         February 14, 1994
         _____________________________________________________________________
         Date


         _____________________________________________________________________
         Signature


          /s/ Deborah A. Rees, Assistant Vice President 
          
         _____________________________________________________________________
         





         _____________________________________________________________________
         Date



         _____________________________________________________________________
         Signature


         _____________________________________________________________________
         Name/Title



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         Item 10 - Certification.

            By signing below I certify that, to the best of my knowledge and
         belief, the securities referred to above were acquired in the ordinary
         course of business and were not acquired for the purpose of and do not
         have the effect of changing or influencing the control of the issuer
         of such securities and were not acquired in connection with or as a
         participant in any transaction having such purposes or effect.



         Signature.

            After reasonable inquiry and to the best of my knowledge and
         belief, I certify that the information set forth in this statement is
         true, complete and correct.



           February 14, 1994
         _____________________________________________________________________
         Date


         _____________________________________________________________________
         Signature


         /s/ Michelle A. O'Donnell, Assistant Vice President and
             Assistant Regulatory Counsel
         _____________________________________________________________________
         





         _____________________________________________________________________
         Date



         _____________________________________________________________________
         Signature



         _____________________________________________________________________
         Name/Title