Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1981-03-30
1983-09-27
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1605
Patent
active
D02707349
REFERENCES:
patent: D137483 (1944-03-01), Swanson
patent: D204911 (1966-05-01), Adams
patent: D223637 (1972-05-01), Mazur
patent: D224053 (1972-06-01), Stein
patent: D230083 (1974-01-01), Adams
patent: 2926591 (1960-03-01), Hoffman
patent: 3105430 (1963-10-01), Fernelius
patent: 3550519 (1970-12-01), Lewis
patent: 3731897 (1973-05-01), Price
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