Communications: electrical – Systems – Call station
Patent
1976-02-23
1977-01-11
Caldwell, John W.
Communications: electrical
Systems
Call station
340256, 340409, 339 80, G08B 2100
Patent
active
040030482
ABSTRACT:
A detection and alarm system for detecting and removal of a fire extinguisher from its usual location including an electrically conductive breakaway lanyard positioned around the neck of the fire extinguisher, its ends connected to two male prongs plugged into a female receptacle of a supervisory circuit leading to an alarm circuit. When the supervisory circuit is interrupted by the removal of a fire extinguisher, a relay trips the alarm circuit.
REFERENCES:
patent: 3145375 (1964-08-01), Webb
patent: 3781861 (1973-12-01), Adler et al.
Caldwell John W.
Cannon James J.
Cannon, Jr. James J.
Wannisky William M.
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