Collapsible image viewing device

Details Collapsible image viewing device Collapsible image viewing device

1980-07-15

1982-09-07

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16 11, D1699

Patent

active

D02660946

REFERENCES:
patent: D142543 (1945-10-01), Bechtell
patent: D197286 (1964-01-01), Rosenthal
patent: D200982 (1965-04-01), Martinez
patent: D204576 (1966-04-01), Caesar
patent: D214957 (1969-08-01), Gulliford
patent: 2699619 (1955-01-01), Fink
patent: 2962825 (1960-12-01), Bravo

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