Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1985-06-21
1988-06-21
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02963361
REFERENCES:
patent: D146258 (1947-01-01), Gans
patent: D187891 (1960-05-01), Marson
patent: D201468 (1965-06-01), Schwartz
patent: D206693 (1967-01-01), Robinson
patent: D234245 (1975-02-01), McGee
patent: D251440 (1979-03-01), Inoue
patent: D260235 (1981-08-01), Anderson
patent: 2595579 (1952-05-01), Hawkins
patent: 2697577 (1954-12-01), Wolf
patent: 2896893 (1959-07-01), Oliver
patent: 3586281 (1971-06-01), Schumer
Holtje Nelson C.
Tupman W. C.
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