Fire and smoke detector and the like
United States Patent 2408051

Inventors:
Donelian, Khatchik O.
Publication Date:
09/24/1946
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Assignee:
AMERICAN DISTRICT TELEGRAPH CO
Primary Class:
340/521
Other Classes:
340/579, 340/634, 313/54, 307/653, 422/98, 307/650
International Classes:
G08B17/113; G08B17/10