Intrusion warning system utilizing an electric field
Invalid bed system
Ionization smoke detector and alarm system
Ionization smoke detector co-used to issue fire alarm and detect
Ionization type smoke sensing device
Ionization-chamber smoke detector system
Ionization-type fire detector
Irrigation signal
Isolated two-wire transmitter
Key actuated electronic lock for auto ignitions
Key release type burglar alarm
Keyless anti-theft entry system
Keysensor
Kiln alarm
Label alarm system
LEAK DETECTION APPARATUS
Leak detection device
Leakage resistance detector and alarm circuit
LED smoke detector circuit
Light emitting diode blown circuit breaker indicator