Slide viewer

Details Slide viewer Slide viewer

1981-01-23

1983-04-12

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1603

Patent

active

D02685892

REFERENCES:
patent: 2849814 (1958-09-01), Rideout
patent: 2869260 (1959-01-01), Rideout
patent: 3373518 (1968-03-01), Bennett
patent: 3748765 (1973-07-01), Bass et al.
patent: 3869819 (1975-03-01), Weggeland

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