Transparency viewer

Details Transparency viewer Transparency viewer

1980-07-31

1983-06-14

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

40367X, D1602

Patent

active

D02693500

REFERENCES:
patent: D118698 (1940-01-01), Gillon
patent: D205103 (1966-06-01), Gingras
patent: D240151 (1976-06-01), Stubbmann
patent: D247969 (1978-05-01), Olson
patent: D251788 (1979-05-01), Alferow
patent: 2755585 (1956-07-01), Lubow
patent: 3521949 (1970-07-01), Karow
patent: 4185407 (1980-01-01), Lamb

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