Revolving photographic slide holder

Details Revolving photographic slide holder Revolving photographic slide holder

1989-05-22

1991-12-03

Ansher, Bernard

Photography and optical equipment

Projector or viewer

Element or attachment

Patent

active

D03220850

REFERENCES:
patent: D122908 (1940-10-01), Stechbait
patent: D204033 (1966-03-01), Hall
patent: D214001 (1969-04-01), Steinbach et al.
patent: D217642 (1970-05-01), Blecher
patent: D244023 (1977-04-01), Wilsch et al.
patent: 2311056 (1943-02-01), Laughberg
patent: 2773323 (1956-11-01), Gorwitz
patent: 3322035 (1967-05-01), Admon
patent: 4473280 (1984-09-01), Staar
patent: 4832482 (1989-05-01), Kallenberg

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