Automatic control device for the operation of visual and audible signals
United States Patent 1779986

Inventors:
Scott, Ernest E.
Publication Date:
10/28/1930
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Assignee:
ELECTRIC ALARM CO INC
Primary Class:
340/429
Other Classes:
340/322, 200/DIG.008, 411/935
International Classes:
G08B7/06; G08B7/00