Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Temperature – humidity – atmospheric condition
Patent
1985-03-13
1987-10-20
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Temperature, humidity, atmospheric condition
Patent
active
D02923823
REFERENCES:
patent: D246766 (1977-12-01), Everest
patent: D247352 (1978-02-01), Heininger
patent: D254959 (1980-05-01), Everest
patent: 1891039 (1932-12-01), Barton
patent: 1908977 (1933-05-01), Gruss
patent: 3264931 (1966-08-01), Ackerman
patent: 3269255 (1966-08-01), Shaw
patent: 3545868 (1970-12-01), Duncan
patent: 4400097 (1983-08-01), Koschnitzke
patent: 4634294 (1987-01-01), Christol
Leeds & Northrup Co. (Flyer)--11/5/68--front cover--#8634 Precision Optical Pyrometer at top left.
Holtje Nelson C.
Quantum Logic Corporation
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