Magnetic compass

Details Magnetic compass Magnetic compass

1985-08-27

1989-01-03

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D02992167

REFERENCES:
patent: D103321 (1937-02-01), Huu
patent: D151872 (1948-11-01), Carsson
patent: D184270 (1959-01-01), Winkler
patent: D200000 (1965-01-01), Richards
patent: D249650 (1978-09-01), Schoenfeld
patent: D278037 (1985-03-01), Hattori
patent: 3286358 (1966-11-01), Smokowski

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