Drawing instrument

Details Drawing instrument Drawing instrument

1992-05-04

1994-03-22

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03453111

REFERENCES:
patent: D116928 (1939-10-01), Dowd
patent: D166905 (1952-06-01), Coates
patent: D253956 (1980-01-01), Edlund
patent: D277366 (1985-01-01), Hayward
patent: D328434 (1992-08-01), Taggart
patent: 3835542 (1974-09-01), DeMathe

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