Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent
1978-11-13
1981-07-21
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Geometric
D1004
Patent
active
D02599244
REFERENCES:
patent: 3460261 (1969-08-01), Frey
patent: 3925899 (1975-12-01), Hesse
Popular Mechanics-11/78, p. 38-Compass at bottom-right.
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