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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
66570	Mine Safety Appliances Co	MSA	Orthopedic, Prosthetic & Surgical Appliances & Supplies (3842)	250668780

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1001300	Iii T John Ryan	121 Gamma Drive Ridc Industrial Park Pittsburgh PA 15238	Chairman	Yes	Yes	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, No Par Value	Disposition	2010-05-11	6,750	$29.12	980,376	No	4	S	Direct
Common Stock, No Par Value	Disposition	2010-05-11	10,000	$28.70	970,376	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock, No Par Value	1,521,889	Indirect	As Co-Trustee
Common Stock, No Par Value	354,731	Indirect	By Wife
Common Stock, No Par Value	160,357	Indirect	By Wife as Trustee
Common Stock, No Par Value	474,156	Indirect	Co-Trustee

Footnotes

Shares sold to satisfy tax obligation resulting from option exercise dated May 5, 2010.
Share prices for this transaction ranged from $29.0020 to $29.2118.
Share prices on this transaction ranged from $28.5000 to $28.9040.
Shares held in a trust of which I am a Trustee and in which a member of my immediate family is the beneficiary. I disclaim beneficial ownership of these shares.
I disclaim beneficial ownership of these shares.
Shares held in trusts of which I am not a trustee and in which members of my immediate family are beneficiaries. I disclaim beneficial ownership of these shares.
Shares held in trusts of which I am a trustee and in which I and members of my immediate family are among the beneficiaries.