Darkfield loupe

Details Darkfield loupe Darkfield loupe

1992-10-27

1994-10-04

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

Patent

active

D03511766

REFERENCES:
patent: D271308 (1983-11-01), Leo
patent: 2157437 (1939-05-01), Shipley, Jr.
patent: 4291938 (1981-09-01), Wagner
patent: 4647194 (1987-03-01), Shigetomi et al.
patent: 5146288 (1992-09-01), Russell
patent: 5260763 (1993-11-01), Yamashita

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