X0202 4 2004-08-19 0000066570 MINE SAFETY APPLIANCES CO MSA 0001187321 BIGLER JOSEPH A 121 GAMMA DRIVE RIDC INDUSTRIAL PARK PITTSBURGH 15238 1 Vice President Common Stock, no par value 2004-08-19 4 M 0 12378 6.5 A 50898 D Common Stock, no par value 2004-08-19 4 S 0 432 40.75 D 50466 D Common Stock, no par value 2004-08-19 4 F 0 1974 40.75 D 48492 D Incentive Stock Option 19.5008 2004-08-19 4 M 0 12378 6.5 D 2000-08-28 2010-02-28 Common Stock, no par value 12378 0 D This option was previously reported as an option for 4,755 shares at an exercise price of 21.02083, but was adjusted to reflect the special distribution paid on November 24, 2003 and the 3-for-1 stock split paid on January 28, 2004. Douglas K. McClaine, Attorney in Fact, Power of Attorney 2004-08-23