Photographic camera back or similar article

Details Photographic camera back or similar article Photographic camera back or similar article

1984-12-10

1986-12-30

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16 38

Patent

active

D02875020

REFERENCES:
patent: 3405620 (1968-10-01), Friedman
patent: 3437023 (1969-04-01), Downey
patent: 3491671 (1970-01-01), Engeldrum
patent: 4023191 (1977-05-01), Augustin

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