Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1983-06-24
1985-10-01
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 38
Patent
active
D02808285
REFERENCES:
patent: 1378709 (1921-05-01), Martin
patent: 1410130 (1922-03-01), Sinclair
patent: 2757471 (1956-08-01), Vlock
patent: 3371439 (1968-03-01), Smith
patent: 3431667 (1969-03-01), Woods
Castle Linval B.
Holtje Nelson C.
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