Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1974-11-29
1977-02-08
Stearman, Joel
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1605
Patent
active
D02433273
REFERENCES:
patent: 3794822 (1974-02-01), Bergmans
patent: D210169 (1968-02-01), Monson
patent: D233257 (1974-10-01), Holtje
Rademaker C. A.
Stearman Joel
Trifari Frank R.
U.S. Philips Corporation
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