Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-02-01
1984-10-30
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02761653
REFERENCES:
patent: D145364 (1946-08-01), Rubin
patent: D160039 (1950-09-01), Van Dyck
patent: D218071 (1970-07-01), Armbruster
patent: 2169010 (1939-08-01), Teague
Product Engineering-4/52-p. 172-Slide Projector at bottom right.
Design-8/57-p. 37-Slide Projector at left center.
Holtje Nelson C.
Spencer Alan H.
Warner Lambert Technologies, Inc.
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