Optical viewfinder

Details Optical viewfinder Optical viewfinder

1978-02-01

1984-07-10

Kemper, Catherine E.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16101

Patent

active

D02746255

REFERENCES:
patent: 1682139 (1928-08-01), Mitchell
patent: 2574072 (1951-11-01), Updegraff
patent: 3839725 (1974-10-01), Koppensteiner
Burke & James Inc. Photographic Equipment Catalog, p. 46, "Zoom Type" Viewfinder.

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