Exhibit 23
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-121196) of Mine Safety Appliances Company of our report dated JuneĀ 19, 2009 relating to the financial statements of the MSA Retirement Savings Plan, which appears in this Form 11-K.
/s/ PRICEWATERHOUSECOOPERS LLP
Pittsburgh, Pennsylvania
JuneĀ 19, 2009