Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1978-10-17
1983-05-17
Kemper, Catherine E.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1604
Patent
active
D02690152
REFERENCES:
patent: 2548573 (1951-04-01), Wampole et al.
patent: 3388652 (1968-06-01), Parrent, Jr.
patent: 3785268 (1974-01-01), Gregg et al.
patent: 4134664 (1979-01-01), Morokuma et al.
Kemper Catherine E.
Secrest Thomas W.
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