Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Temperature – humidity – atmospheric condition
Patent
1975-03-03
1977-04-26
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Temperature, humidity, atmospheric condition
D1004
Patent
active
D02441241
REFERENCES:
patent: D234534 (1975-03-01), Davidson
patent: D236253 (1975-08-01), Parker
patent: D240024 (1976-05-01), Riley
patent: D240607 (1976-07-01), Riley
patent: 2614430 (1952-10-01), Ballard
patent: 2799167 (1957-07-01), Loconti
patent: 3893340 (1975-07-01), Parker
Office Products, Sept. 1973-p. 20-Dig. Thermometer.
Holtje Nelson C.
Widdowson John H.
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