Title:
COMBINED FIRE ALARM,BURGLAR ALARM,AND INTERCOMMUNICATION SYSTEM
United States Patent 3487404
Inventors:
Midkiff, James C.
Publication Date:
12/30/1969
Export Citation:
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Assignee:
AVCO CORP
Primary Class:
340/521
Other Classes:
331/47, 340/384.7, 340/533, 340/541, 340/577
International Classes:
G08B19/00; G08B19/00; (IPC1-7): G08B1/08; G08B3/00; G08B19/00
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US Patent References:
3174143Electrical protective system
3137846Electronic sirens
3051944Electronic siren and communication apparatus




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