Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-09-30
1982-11-23
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1699
Patent
active
D02670135
REFERENCES:
patent: D218805 (1970-09-01), Stone
patent: D218806 (1970-09-01), Berg
patent: D223484 (1972-04-01), Turner
patent: 3326425 (1967-06-01), Smith
Alexander Cruzan
Gort Randall J.
Holtje Nelson C.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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