Optical viewer

Details Optical viewer Optical viewer

1993-04-16

1995-02-21

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

Patent

active

D03556638

REFERENCES:
patent: D337339 (1993-07-01), An
patent: 542804 (1895-07-01), Piaget
patent: 999512 (1911-08-01), Miele
patent: 2244235 (1941-06-01), Ayres
patent: 2375634 (1945-05-01), Dunning
patent: 3160056 (1964-12-01), Taylor
patent: 4793671 (1988-12-01), Palochak et al.
patent: 4799764 (1989-01-01), Crowell

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