Folding transparency viewer

Details Folding transparency viewer Folding transparency viewer

1981-01-26

1983-04-12

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1603

Patent

active

D02685922

REFERENCES:
patent: 2617218 (1952-11-01), Antos
patent: 2983061 (1961-05-01), Mairshofer
patent: 3076276 (1963-02-01), Pitchford
patent: 3967401 (1976-07-01), Numbers
patent: 4173838 (1979-11-01), Antos

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