United States Patent 3258757
Publication Date:
06/28/1966
Export Citation:
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Primary Class:
340/514
Other Classes:
340/581, 340/593, 340/691.1, 374/E1.004
International Classes:
G01K1/02; G08B5/38; G08B17/06; G01K1/00; G08B5/22; G08B17/06
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US Patent References:
2982949Portable thermal alarm and signal system
2915742Combined illumination device and fire alarm
2839741Indicator lamp test circuit
2816280Portable fire alarm
2741099Apparatus for indicating and controlling the temperature of products within predetermined limits