About 4 Trademarks found that are filed by the law firm Jennifer L Sherman Federal Signal Corporation

ELECTRICAL REVOLVING WARNING SIGNAL LIGHTS FOR USE ON EMERGENCY ROAD VEHICLES, SUCH AS POLICE CARS AND FIRE AND HIGHWAY DEPARTMENT VEHICLES

ELECTRICALLY OPERATED AUDIBLE SIGNAL AND ALARM DEVICES-NAMELY, HORNS

audible signaling devices for emergency warning purposes comprising control box, horn, amplifier, and speaker; voice override system comprising control box, microphone, speakers, and amplifier; and accessories; namely, tone modules and relay modules

Warning lightbar for use on emergency vehicles