Drafting ruler

Details Drafting ruler Drafting ruler

1987-12-18

1991-04-09

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03160513

REFERENCES:
patent: 26251 (1876-11-01), Copland
patent: D204017 (1966-03-01), Goldman
patent: D206551 (1966-12-01), Nystrom
patent: D224717 (1972-09-01), Pistorius
patent: D273769 (1984-05-01), Sidrak
patent: 289512 (1883-12-01), Darling
patent: 317188 (1885-05-01), Pederson
patent: 4641436 (1987-02-01), Tzen et al.
patent: 4734993 (1988-04-01), Pan
patent: 4750270 (1988-06-01), Kundikoff

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