Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1979-04-04
1982-07-06
Kemper, Catherine E.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1601
Patent
active
D02653214
REFERENCES:
patent: 3643576 (1972-02-01), Daitoku et al.
patent: 3762291 (1973-10-01), Kimura et al.
patent: 4006489 (1977-02-01), Aizawa et al.
patent: 4167314 (1979-09-01), Ichiyanagi et al.
Kemper Catherine E.
Veb Pentacon Dresden Kamera-und Kinowerke
Wray James C.
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