Noise actuated disabling unit
United States Patent 2779935
US Patent References:
Electrical alarm system
- - 2422542
Voice-frequency signaling system
- - 2572074
Selective calling system
- - 2602852
Circuit for detection of frequency differences and apparatus employing same
- - 2623931
Electrical alarm system
- - 2422542
Voice-frequency signaling system
- - 2572074
Selective calling system
- - 2602852
Circuit for detection of frequency differences and apparatus employing same
- - 2623931
Inventors:
Lee, Loudon Clifford
Riker, William E.
Riker, William E.
Publication Date:
01/29/1957
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Export Citation:
Assignee:
HOLMES ELECTRIC PROTECTIVE COM
Primary Class:
Other Classes:
367/94, 367/901, 367/197, 367/93
International Classes:
G08B13/16