FSS

Federal Signal Corporation

A maker of street sweepers, sewer cleaners, and emergency warning equipment, Federal Signal builds the machines that keep cities clean and safe — its products include the sirens and lights on fire trucks and police cars, plus outdoor tornado warning sirens. Founded in 1901 in Chicago as the Federal Electric Company, it started by making electric store signs before buying siren patents in 1915. Its famous Thunderbolt siren, produced from 1952 to 1990, is a beloved icon among siren enthusiasts for its supercharged, extra-loud design.