Directional compass

Details Directional compass Directional compass

1991-09-19

1994-03-01

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03446808

REFERENCES:
patent: D297515 (1988-09-01), Yusa
patent: 4438568 (1984-03-01), Kramer et al.

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