Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1985-07-25
1988-02-16
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D16 13, D16 14, D16 15, D16 19
Patent
active
D02942682
REFERENCES:
patent: D115397 (1939-06-01), Harrison
patent: D132629 (1942-06-01), Mortimer
patent: D144688 (1946-05-01), Briskin
patent: D181589 (1957-12-01), Kellock
patent: D255581 (1978-06-01), Owens
patent: 1272547 (1918-07-01), Singer
patent: 2174194 (1939-09-01), Nemnich
patent: 2239032 (1941-04-01), Boch
patent: 2591519 (1952-04-01), Decker
patent: 4073581 (1978-02-01), Rayburn
patent: 4081920 (1978-04-01), Magee
Holtje Nelson C.
Tupman W. C.
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