MSA Safety Inc — Director's Dealing 2010

May 7, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

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

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-05-05	Common Stock, no par value	M	54000	$7.7957	Acquired	1001896	Direct
2010-05-05	Common Stock, no par value	F	14770	$28.5	Disposed	987126	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-05-05	Non-statutory Stock Option	$7.7957	M	54000	Disposed	2011-03-12	Common Stock, no par value (54000)	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 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.

F2: I disclaim beneficial ownership of these shares.

F3: 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.

F4: Shares held in trusts of which I am a trustee and in which I and members of my immediate family are among the beneficiaries.