Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1984-08-23
1987-12-01
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
Patent
active
D02929821
REFERENCES:
patent: D246528 (1977-11-01), Miller
patent: 2556598 (1951-06-01), Rasine
patent: 2563389 (1951-08-01), Blum
patent: 2882001 (1959-04-01), Ries
patent: 3163387 (1964-12-01), Thomas
patent: 3712571 (1973-01-01), Miller
patent: 3870265 (1975-03-01), Osborne
patent: 4562985 (1986-01-01), Nakatani
Holtje Nelson C.
Velbon International Corp.
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