Magnetic compass

Details Magnetic compass Magnetic compass

1984-03-19

1987-03-17

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65, D10 70

Patent

active

D02887886

REFERENCES:
patent: D206105 (1966-10-01), Foster
patent: D250754 (1979-01-01), Gray
patent: D254125 (1980-02-01), Powell
patent: D259924 (1981-07-01), Bergkvist
patent: 2007986 (1935-07-01), Sprague
patent: 2487044 (1949-11-01), Cude
patent: 3427724 (1969-02-01), Tracy
patent: 3544253 (1970-12-01), Bloom

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