Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1978-11-27
1981-06-16
Kemper, Catherine E.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 02, D16 59, D1601
Patent
active
D02595699
REFERENCES:
patent: 2013288 (1935-09-01), Porter
patent: 2032676 (1936-03-01), Warmisham
patent: 2882791 (1959-04-01), Moller et al.
patent: 3418032 (1968-12-01), Kajiro
patent: 4067027 (1978-01-01), Yamazaki
J. Gerber and Co., (Japan) Ltd.
Kemper Catherine E.
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