Electric alarm system
United States Patent 2249891

Inventors:
Harald, Ekman Olof Ingemar
Teodor, Nicou Hans
Publication Date:
07/22/1941
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Assignee:
Harald, Ekman Olof Ingemar
Teodor, Nicou Hans
Primary Class:
340/508
Other Classes:
340/590, 340/693.100
International Classes:
G08B17/06