Portable compass

Details Portable compass Portable compass

1985-07-01

1988-09-06

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D02975157

REFERENCES:
patent: D7837 (1874-11-01), Baker
patent: D106533 (1937-10-01), Frank
patent: 390115 (1888-09-01), Delany
patent: 1098851 (1914-06-01), Stockton
patent: 2541432 (1951-02-01), Muehlbauer
patent: 3978591 (1976-09-01), Jaaskelainen

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