Screen unit

Details Screen unit Screen unit

1979-02-21

1981-10-06

Caun, Peter M.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1605

Patent

active

D02611490

REFERENCES:
patent: 1474951 (1923-11-01), Thompson
patent: 2271199 (1942-01-01), Mandell
patent: 3849910 (1974-11-01), Greenly

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