Photography and optical equipment – Projector or viewer – With provision for transparency magazine
Patent
1974-05-23
1977-02-08
Holtje, Nelson C.
Photography and optical equipment
Projector or viewer
With provision for transparency magazine
D1605
Patent
active
D02433281
REFERENCES:
patent: 3006052 (1961-10-01), Stickney
patent: D146167 (1947-01-01), Bentzman
patent: D149878 (1948-06-01), Kammermeyer
patent: D223638 (1972-05-01), Smith
Popular Photography -- May 1938 -- p. 83 -- Tripod at right.
Angus D. Gordon
Holtje Nelson C.
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