Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1978-03-27
1980-10-14
Kemper, Catherine E.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1604
Patent
active
D02573555
REFERENCES:
patent: 3705544 (1972-12-01), Ratowsky
patent: 3856395 (1974-12-01), Comstock
patent: 3977876 (1976-08-01), Ratowsky
patent: 3981488 (1976-09-01), Ratowsky
Creative Phototronics, Inc.
Kemper Catherine E.
Limbach Karl A.
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