Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1981-09-14
1983-12-20
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1604
Patent
active
D02718839
REFERENCES:
patent: D237904 (1975-12-01), Montefusco
patent: T903018 (1972-10-01), Dexter
patent: 2578048 (1951-12-01), Dalton
patent: 3254586 (1966-06-01), Haus
patent: 3851969 (1974-12-01), Haus
patent: 4182569 (1980-01-01), Smith
Holtje Nelson C.
Master Etching Machine Company
Weber Richard D.
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