Security apparatus with audible alarm of enhanced urgency
Signal light
Signal switching circuit for multiple sound siren system
Simulated static noise generator
Small sound generating device
Small type acoustic device
Snap-on housing adapted for panel mounting of transducer
Sound actuator
Sound effects producer
Sound generating system for a sound masking package
Sound generator
Sound producing device
Sound simulator for model steam engine
Sound-effects generating device for activity toys or vehicles
Speaker activation control by microcomputer
Speaker driver
Substitute warning device for automobile seat belt reminder alar
Switch-off device for electrically operated clock alarm and cont
Switching amplifier and electronic siren employing the same
System for controlling an electronic warning device