Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-08-12
1984-11-13
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D14 11
Patent
active
D02763486
REFERENCES:
patent: D220006 (1971-02-01), Bakken
patent: 4302102 (1981-11-01), Stark
Holtje Nelson C.
Kis France
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