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Electronic alarm
United States Patent 2355752
Inventors:
Repking, Joseph T.
Publication Date:
08/15/1944
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Download PDF 2355752
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Assignee:
Repking, Joseph T.
Primary Class:
340/642
Other Classes:
361/170, 256/10, 307/132E, 340/664, 307/97
International Classes:
G08B23/00