Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-09-11
1982-08-03
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1605
Patent
active
D02656574
REFERENCES:
patent: 2624252 (1953-01-01), Judd
patent: 2791950 (1957-05-01), Oppenheimer
patent: 2860562 (1958-11-01), Swift
patent: 2893303 (1959-07-01), Geraci
patent: 3491669 (1970-01-01), McBride
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