Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1981-02-20
1983-04-12
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1603
Patent
active
D02685914
REFERENCES:
patent: D181019 (1957-09-01), Parcher
patent: D211135 (1968-05-01), Tan
patent: 3018575 (1962-01-01), Barre
patent: 3153293 (1964-10-01), Clarkson
patent: 3748765 (1973-07-01), Bass
Joffe Richard M.
Miller Paul D.
Holtje Nelson C.
View-Master International Group
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