Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1977-05-10
1979-02-27
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1606
Patent
active
D02511967
REFERENCES:
patent: D163355 (1951-05-01), Bintz
patent: D215968 (1969-11-01), Henshaw
patent: 3116555 (1964-01-01), Helava
patent: 3678582 (1972-07-01), Helava
patent: 3729830 (1973-05-01), Blachut
patent: 3750293 (1973-08-01), Forrest
Zeiss Aerotopo Brochure #ZA215e-9/14/55-p. 3-Mirror Stereo-Scope.
Holtje Nelson C.
Keuffel & Esser Company
White Lionel N.
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