Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1979-04-30
1981-10-20
Caun, Peter M.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1604
Patent
active
D02613964
REFERENCES:
patent: 3657990 (1972-04-01), Wilhelm
patent: 4001855 (1977-01-01), Wilhelm
patent: 4147423 (1979-04-01), Sayre
Batie A.
Caun Peter M.
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