Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Temperature – humidity – atmospheric condition
Patent
1982-04-19
1984-08-14
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Temperature, humidity, atmospheric condition
Patent
active
D02750856
REFERENCES:
patent: 477551 (1892-06-01), Kerr
patent: 1742574 (1930-01-01), Breedlove
Holtje Nelson C.
Perrella D. J.
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