MSA Safety Inc — Director's Dealing 2010

May 12, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MINE SAFETY APPLIANCES CO (MSA)
CIK: 0000066570
Period of Report: 2010-05-11

Reporting Person: RYAN JOHN T III (Director, Chairman, 10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-11	Common Stock, no par value	S	6750	$29.1236	Disposed	980376	Direct
2010-05-11	Common Stock, no par value	S	10000	$28.7021	Disposed	970376	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock, no par value	1521889	Indirect
Common Stock, no par value	354731	Indirect
Common Stock, no par value	160357	Indirect
Common Stock, no par value	474156	Indirect

Footnotes

F1: Shares sold to satisfy tax obligation resulting from option exercise dated May 5, 2010.

F2: Share prices for this transaction ranged from $29.0020 to $29.2118.

F3: Share prices on this transaction ranged from $28.5000 to $28.9040.

F4: 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.

F5: I disclaim beneficial ownership of these shares.

F6: 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.

F7: Shares held in trusts of which I am a trustee and in which I and members of my immediate family are among the beneficiaries.