Electronic compass

Details Electronic compass Electronic compass

1985-10-15

1988-05-24

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65

Patent

active

D02958406

REFERENCES:
patent: 3584388 (1971-06-01), Petrov
patent: 4322835 (1982-03-01), Ernst
patent: 4402142 (1983-09-01), Dinsmore

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