Title:
Alarm system
United States Patent 3134970

Inventors:
Kelly, Lawrence H.
Martina Jr., Anthony C. LA.
Publication Date:
05/26/1964
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Assignee:
AMERICAN DISTRICT TELEGRAPH CO
Primary Class:
340/515
Other Classes:
340/693.400, 327/576, 327/569, 361/182, 340/566
International Classes:
G08B13/16
US Patent References:
2983912Signalling circuit
3010100Direct current operated burglar alarm system with alternating current supervision
3045150Time delay circuit
3049699Sound actuated detection and alarm system