Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent
1988-01-11
1990-12-25
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Geometric
Patent
active
D03131890
REFERENCES:
patent: D141088 (1945-05-01), Boyce
patent: D192302 (1962-02-01), Fulton
patent: 657443 (1900-09-01), Newton
patent: 2667703 (1954-02-01), Zumkeller
patent: 3661469 (1972-05-01), Leff
Holtje Nelson C.
Watson Gary D.
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