Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1976-12-20
1979-09-25
Feifer, Melvin B.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D14 5, D14 6, D14 70, D14 72, D16 59, D1601
Patent
active
D02529963
REFERENCES:
patent: D206462 (1966-12-01), Petrusek
patent: D210058 (1968-01-01), Lang et al.
patent: D217414 (1970-04-01), Lang et al.
patent: D228808 (1973-10-01), Swayze
patent: D236009 (1975-07-01), Hattori
patent: 2780263 (1957-02-01), Blumberg
patent: 3927809 (1975-12-01), Klein, Sr.
Feifer Melvin B.
Groff, Jr. Emory L.
Word George P.
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