Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Regulator or control
Patent
1979-07-05
1981-09-29
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Regulator or control
D1004
Patent
active
D02609711
REFERENCES:
patent: D248455 (1978-07-01), Cunnie
patent: 3775595 (1973-11-01), Rosse
patent: 4079336 (1978-03-01), Wong
patent: 4191328 (1980-03-01), Isaacs
API Temperature Controllers Bulletin #49-B, 3/67, p. 9, Model 731 at top.
Holtje Nelson C.
Nitkin William
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