Magnetic compass

Details Magnetic compass Magnetic compass

1979-07-20

1982-03-16

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02633795

REFERENCES:
patent: D148962 (1948-03-01), Sherrill
patent: D172940 (1954-08-01), Taylor
patent: 1860259 (1932-05-01), Marshall
patent: 2155712 (1939-04-01), Hull
patent: 2177218 (1939-10-01), Klein
patent: 3473234 (1969-10-01), Kjellstrom

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