Compass heading display

Details Compass heading display Compass heading display

1981-10-30

1984-02-14

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65, D10 67, D10 68, D1004

Patent

active

D02726084

REFERENCES:
patent: D135533 (1943-04-01), Braddon
patent: D139426 (1944-11-01), Heintz
patent: D250097 (1978-10-01), Hendershot
patent: D257832 (1981-01-01), Flint
patent: D259924 (1981-07-01), Bergkvist
patent: 3525091 (1970-08-01), Lally
patent: 3609750 (1971-09-01), Budd
patent: 3689835 (1972-09-01), Bickford
patent: 3726250 (1973-04-01), Merk
Popular Mechanics-11/78-p. 38-Compass at bottom right.

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