Proportional plotting device

Details Proportional plotting device Proportional plotting device

1982-06-23

1985-01-29

Ansher, Bernard

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

33137L

Patent

active

D02773651

REFERENCES:
patent: 120621 (1871-11-01), Chassaing
patent: 2331298 (1943-10-01), Bennett
patent: 2685748 (1954-08-01), Gilbert
Dietzgen Co. Catalog, 1946, p. 243, item #1803C.

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