EXHIBIT 21

MINE SAFETY APPLIANCES COMPANY

The registrant’s present affiliates include the following:

Name	State or Other Jurisdiction of Incorporation
Compañia MSA de Argentina S.A.	Argentina
MSA (Aust.) Pty. Limited	Australia
MSA-Auer Sicherheitstechnik Vertriebs GmbH	Austria
MSA Belgium NV	Belgium
MSA do Brasil Ltda.	Brazil
MSA Canada	Canada
MSA de Chile Ltda.	Chile
Wuxi-MSA Safety Equipment Co. Ltd.	China
MSA International, Inc.	Delaware
Microsensor Systems, Inc.	Kentucky
MSA Gallet	France
MSA Auer	Germany
MSA Europe	Germany
MSA-Auer Hungaria Safety Technology	Hungary
MSA Italiana S.p.A.	Italy
MSA Japan Ltd.	Japan
MSA Safety Malaysia Snd Bhd	Malaysia
MSA de Mexico, S.A. de C.V.	Mexico
MSA Nederland, B.V.	Netherlands
MSA del Peru S.A.C.	Peru
MSA-Auer Polska Sp. z o.o.	Poland
MSA (Britain) Limited	Scotland
MSA S.E. Asia Pte. Ltd.	Singapore
MSA Africa (Pty.) Ltd.	South Africa
MSA Española S.A.	Spain
MSA Nordic	Sweden
Sordin AB	Sweden
Aritron Instrument A.G.	Switzerland
MSA Zimbabwe (Pvt.) Limited	Zimbabwe

The above-mentioned affiliated companies are included in the consolidated financial statements of the registrant filed as part of this annual report. The names of certain other affiliates, which considered in the aggregate as a single affiliate would not constitute a significant affiliate, have been omitted.