Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-02-01
1982-03-09
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1601
Patent
active
D02633108
REFERENCES:
patent: D253475 (1979-11-01), Kramer
patent: 3094911 (1963-06-01), Reiche
patent: 3999194 (1976-12-01), Imura
patent: 4137539 (1979-01-01), Maitani
Holtje Nelson C.
Ricoh & Company, Ltd.
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