Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Weight – force or density
Patent
1979-11-19
1981-09-15
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Weight, force or density
D1004
Patent
active
D02607395
REFERENCES:
patent: 2957339 (1960-10-01), Penny
patent: 3053078 (1962-09-01), Jewett
patent: 3327825 (1967-06-01), Fann
patent: 3803903 (1974-04-01), Lin
patent: 4241601 (1980-12-01), Pennington
Beavers Lucian Wayne
Halliburton Company
Holtje Nelson C.
Tregoning John H.
Weaver Thomas R.
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