Signalling apparatus incorporating a differential relay
United States Patent 3222662
US Patent References:
Selective smoke detector
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Selective smoke detector
- - 2033466
Detection of suspended matter in fluids
- - 2119326
Apparatus for controlling the condition of material
- - 2299529
Smoke detector and signal
- - 2537028
Unit for detecting suspended matter in fluids
- - 2682613
Inventors:
Philip, Giuffrida
Publication Date:
12/07/1965
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Assignee:
ELECTRONICS CORP AMERICA
Primary Class:
Other Classes:
340/594, 250/565, 356/339, 340/693.600, 340/643, 340/630, 340/521, 340/640
International Classes:
G08B17/06
US Patent References: