Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-03-03
1984-09-18
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02755718
REFERENCES:
patent: D187248 (1960-02-01), Sampson
patent: D215498 (1969-09-01), Ceccacci
patent: 2963543 (1960-12-01), Link
patent: 3668986 (1972-06-01), Lemaire
Holtje Nelson C.
Low Warren N.
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