Transparency viewer

Details Transparency viewer Transparency viewer

1983-07-18

1985-09-10

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16 11, D16 17

Patent

active

D02805170

REFERENCES:
patent: D114789 (1939-05-01), Hopkins
patent: D151479 (1948-10-01), Way
patent: D193411 (1962-08-01), Farber
patent: D211833 (1968-07-01), Martinez
patent: D242915 (1977-01-01), Wang
patent: D254075 (1980-01-01), Bartholomew
patent: D257852 (1981-01-01), Schlagheck
patent: 3527530 (1970-09-01), Hughes

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