Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1976-03-03
1976-12-21
Ansher, Bernard
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1606
Patent
active
D02427915
REFERENCES:
patent: 1360735 (1920-11-01), Mazuel
patent: 3186300 (1965-06-01), Littmann
patent: 3582178 (1971-06-01), Boughton et al.
patent: 3895854 (1975-07-01), Ziffer
American Optical Corporation
Ansher Bernard
Nealon William C.
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