Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1980-10-15
1984-04-24
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02735911
REFERENCES:
patent: D122818 (1940-10-01), Geppert
patent: D137656 (1944-04-01), Koch
patent: D239467 (1976-04-01), Ouden
patent: 3369451 (1968-02-01), Brandt
patent: 3607587 (1971-09-01), Langkopf
patent: 3808722 (1974-05-01), Byers
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