Level

Details Level Level

1983-01-31

1985-08-20

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D02801850

REFERENCES:
patent: D168401 (1952-12-01), Harris
patent: D224663 (1972-08-01), de Jong
patent: D261369 (1981-10-01), Smith
patent: 1691776 (1928-11-01), Mayes
patent: 4407075 (1983-10-01), MacDermott
patent: 4419833 (1983-12-01), Wright

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