EXHIBIT 21 FEDERAL SIGNAL CORPORATION Subsidiaries of the Registrant The following table sets forth information concerning significant subsidiaries of the Registrant. Jurisdiction in which Name Organized ---------------------------------------- ------------ Aplicaciones Tecnologicas VAMA S.L. Spain Bassett Rotary Tool Company Indiana Dayton Progress Canada, Ltd. Ontario, Canada Dayton Progress Corporation Ohio Dayton Progress International Corporation Ohio Dayton Progress (U.K.), Ltd. United Kingdom Dico Corporation Michigan Elgin Sweeper Company Delaware Emergency One, Inc. Delaware Federal APD, Inc. Michigan Federal Signal Credit Corporation Delaware Federal Signal International (FSC), Ltd. Jamaica, W.I. Guzzler Manufacturing, Inc. Alabama Jamestown Punch and Tooling, Inc. New York Justrite Manufacturing Company, L.L.C. Delaware Manchester Tool Company Delaware Nippon Dayton Progress K.K. Japan Ravo International (Van Raaij Holdings BV and its subsidiaries) Netherlands Schneider Stanznormalien GmbH Germany Superior Emergency Vehicles, Ltd. Alberta, Canada Vactor Manufacturing, Inc. Illinois