Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1981-06-08
1983-11-22
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1604
Patent
active
D02714981
REFERENCES:
patent: D108282 (1938-02-01), Finch
patent: D189895 (1961-03-01), Benson
patent: D200449 (1965-02-01), Bravo
patent: D221024 (1971-06-01), Lee
patent: D240080 (1976-05-01), Brown
patent: D265739 (1982-08-01), Koyama
patent: 3136237 (1964-06-01), Moon
patent: 3165998 (1965-01-01), Reick
patent: 3826300 (1974-07-01), Lee
Haken Jack E.
Holtje Nelson C.
North American Philips Corporation
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