Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1982-09-17
1985-05-14
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02788250
REFERENCES:
patent: D157515 (1950-02-01), Perzentka
patent: D214959 (1969-08-01), Anderson
patent: D230085 (1974-01-01), Allis
patent: D263962 (1982-04-01), Kurozumi
patent: D267565 (1983-01-01), Fossella
patent: D267804 (1983-02-01), Kaluitis
patent: D272830 (1984-02-01), Hara
patent: 4421404 (1983-12-01), Conly
Goto Tetsuya
Saito Yasuhiro
Umino Toshio
Holtje Nelson C.
Ricoh & Company, Ltd.
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