Communications: electrical – Audible indication – Pneumatic-type sound producer
Patent
1976-02-20
1977-05-24
Waring, Alvin H.
Communications: electrical
Audible indication
Pneumatic-type sound producer
3402131, G08B 2500
Patent
active
040259188
ABSTRACT:
An alarm system remote monitor panel having a series of control units, each unit being provided with a light cell, diodes and a coil so that when a remote sensor triggers an alarm, the light will be illuminated and the audio unit activated. The audio may be disconnected at the monitor panel, and the light turned off at the sensor.
REFERENCES:
patent: 2840804 (1958-06-01), Rodgers
patent: 2917731 (1959-12-01), Rodgers
patent: 2934752 (1960-04-01), Arrasmith
Waring Alvin H.
Wyatt Ranseler O.
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