Title:
Smoke detector and signal
United States Patent 2537028

Inventors:
Noel, Cahusac Clarence
Allen, Frank B.
Publication Date:
01/09/1951
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Assignee:
C O TWO FIRE EQUIPMENT CO
Primary Class:
250/574
Other Classes:
340/945, 340/630
International Classes:
G08B17/107; G08B17/103
US Patent References:
2267319Color grading apparatus