Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Temperature – humidity – atmospheric condition
Patent
1977-04-07
1979-01-02
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Temperature, humidity, atmospheric condition
D1004
Patent
active
D02506963
REFERENCES:
patent: 2706761 (1955-04-01), Douglas
Holtje Nelson C.
Prutzman John M.
The Cooper Thermometer Company
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