Title:
INTEGRITY CHECK FOR FIRE ALARM CIRCUITS
United States Patent 3540042
Inventors:
Morrow, John T.
Rowley Jr., Walter E.
Publication Date:
11/10/1970
Export Citation:
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Assignee:
EDWARDS CO
Primary Class:
340/502
Other Classes:
340/507, 340/511, 340/512, 340/593
International Classes:
G08B29/06; G08B29/00; (IPC1-7): G08B29/00
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US Patent References:
3010100Direct current operated burglar alarm system with alternating current supervision




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