Electronic chirper
Electronic horn arrangement
Electronic signal generator with periodically varying frequency
Electronic siren
Electronic siren
Electronic siren
Electronic siren amplifier
Electronic Siren Circuit
Electronic siren structure and method
Electronic siren with remote multiplexed control head
Electronic sound generating device
Electronic sounder
Electronically controlled horn for motor vehicles
Emergency vehicle audible warning system
Emergency vehicle audible warning system and method
Envelope control device for piezoelectric buzzer
Excitation circuit for piezo-electric sound generators
Fiber optic message character display device and method of makin
Flexible convex diaphragm sound reproducing device
Frequency generating circuit