Spherical compass

Details Spherical compass Spherical compass

1988-01-11

1990-08-21

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03100405

REFERENCES:
patent: D125445 (1941-02-01), Hull
patent: D280187 (1985-08-01), Nordstrom
patent: D303506 (1989-09-01), Hatakeyama
patent: 1397490 (1921-11-01), Peradotto
patent: 2511688 (1950-06-01), Beauchamp
patent: 3133244 (1964-05-01), Wojtulewicz
patent: 4004348 (1977-01-01), Fowler et al.
patent: 4513509 (1985-04-01), Nordstrom
patent: 4670988 (1987-06-01), Baxter
The Sporting Goods Dealer, 4/1970, p. 238, Compass Attaches to Snowmobile.

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