Intrusion alarm cable supervision system
Low power siren
McCulloh receiver
Multiplex interrogation system using pulses
Outdoor warning siren
Remote control operator for game callers
Remote supervision and control system
Security alarm system
Security alarm system with audio monitoring capability
Security interlock switch system for smoke detectors and the lik
Siren
Siren with remote driver
Small siren having protective screen
Sound generator for a kite
Supervisory circuit for parallel connected devices
System monitor with innate line security ability
Timed buzzer
Timed buzzer
Trouble indicator circuit for a security system
Vibration-resistant coupling for insulated electrical conductor