Drawing instrument

Details Drawing instrument Drawing instrument

1990-01-04

1992-08-04

Walsh, Donald P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 71

Patent

active

D03284344

REFERENCES:
patent: 5138 (1871-07-01), Harmon
patent: 24042 (1895-02-01), Palmer
patent: 25489 (1896-05-01), Tappen et al.
patent: D131626 (1942-03-01), Ellwood et al.
patent: D207794 (1967-05-01), Charrington
patent: 4211010 (1980-07-01), Barke et al.

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