Directional compass

Details Directional compass Directional compass

2000-02-04

2000-12-26

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

1004

Patent

active

D04354672

REFERENCES:
patent: D427531 (2000-07-01), Hartmann et al.
patent: D427532 (2000-07-01), Hartmann et al.

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