Drawing instrument

Details Drawing instrument Drawing instrument

1988-07-07

1991-05-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03171310

REFERENCES:
patent: D165849 (1952-02-01), Jordan
patent: D204017 (1966-03-01), Goldman
patent: D251113 (1979-02-01), Oseka
patent: D282671 (1986-02-01), Papsdorf
patent: 2499518 (1950-03-01), Markham
patent: 3138874 (1964-06-01), Cooper
Visual System, Artec Spec-Ulator Copy Fitting Wheel, 1986, p. 199.

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