Drafting machine scale magnifier attachment

Details Drafting machine scale magnifier attachment Drafting machine scale magnifier attachment

1980-04-04

1982-04-06

Holtje, Nelson C.

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

D10 74, D1606

Patent

active

D02637219

REFERENCES:
patent: D218537 (1970-08-01), Bushon
patent: D242329 (1977-02-01), Snarski
patent: D253045 (1979-10-01), Rizer
patent: 1798953 (1931-03-01), Rennicke
patent: 1806422 (1931-05-01), Shaen
patent: 2355161 (1944-08-01), Holstein

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