Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent
1978-01-09
1980-07-01
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Geometric
D1004
Patent
active
D02556634
REFERENCES:
patent: 1435501 (1922-11-01), Runge
patent: 2298898 (1942-10-01), Oswin
patent: 2495789 (1950-01-01), Twells
patent: 2679692 (1954-06-01), Fortner
patent: 3164908 (1965-01-01), Palozie
The Iron Age-2/19/20-p. 354-Plug Gauges.
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