Transparency viewer

Details Transparency viewer Transparency viewer

1988-10-27

1991-07-16

Feifer, Melvin B.

Photography and optical equipment

Projector or viewer

Integrated unit

Patent

active

D03182843

REFERENCES:
patent: D233949 (1974-12-01), Gretz
patent: D239467 (1976-04-01), Ouden
patent: 2209668 (1940-07-01), Thornton, Jr.
patent: 2876674 (1959-03-01), Ohlhaver
patent: 3562939 (1971-02-01), Jacobs, Jr. et al.

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