Slide viewer with magnifier

Details Slide viewer with magnifier Slide viewer with magnifier

1982-04-14

1984-12-04

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

350247

Patent

active

D02766183

REFERENCES:
patent: D199598 (1964-11-01), Lanigan
patent: 245927 (1981-08-01), Allen
patent: D268589 (1983-04-01), Miller
patent: D268590 (1983-04-01), Miller
patent: 2059197 (1936-11-01), Backer
patent: 3527530 (1970-09-01), Hughes
patent: 3748765 (1973-07-01), Bass

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