Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1985-02-08
1987-03-31
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02890550
REFERENCES:
patent: D244089 (1977-04-01), Augustin
patent: D244526 (1977-05-01), Augustin
patent: 4226519 (1980-10-01), Gervais
patent: 4348086 (1982-09-01), Forscher
patent: 4571043 (1986-02-01), Kobayashi
Holtje Nelson C.
Polaroid Corporation
Roman Edward S.
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