Combined ruler and compass

Details Combined ruler and compass Combined ruler and compass

1988-06-08

1991-05-21

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03169790

REFERENCES:
patent: D251252 (1979-03-01), Kamila
patent: 443652 (1890-12-01), Jewell
patent: 985978 (1911-03-01), Coxhead
patent: 1282020 (1918-10-01), Anderson
patent: 2658278 (1953-11-01), Debs
patent: 2943392 (1960-07-01), Attridge
patent: 3015889 (1962-01-01), Gobman
patent: 3947968 (1976-04-01), Rosenheck

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