Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1983-04-14
1985-07-16
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 38, D16 47
Patent
active
D02796830
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patent: 4313665 (1982-02-01), Spitz
patent: 4340285 (1982-07-01), Clarke
Holtje Nelson C.
Wright William H.
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