Slide viewer

Details Slide viewer Slide viewer

1980-11-13

1983-04-19

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1603

Patent

active

D02686813

REFERENCES:
patent: D181019 (1957-09-01), Parcher
patent: D211135 (1968-05-01), Tan
patent: D215034 (1969-08-01), Steinbach
patent: D215035 (1969-08-01), Steinbach
patent: 3018575 (1962-01-01), Barre
patent: 3626617 (1971-12-01), Frey

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