Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1975-04-10
1977-08-30
Stearman, Joel
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D163
Patent
active
D02456125
REFERENCES:
patent: D198241 (1964-05-01), Burnett
patent: D215037 (1969-08-01), Clark et al.
patent: D218437 (1970-08-01), Plantholt et al.
Rademaker C. A.
Stearman Joel
Stevens Richard K.
Zeuthen & Aagaard A/S
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