Slide frame

Details Slide frame Slide frame

1980-08-12

1982-12-07

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D16 38, D1603

Patent

active

D02671816

REFERENCES:
patent: 3242605 (1966-03-01), Kleinschmict
patent: 3808722 (1974-05-01), Byers
patent: 3934367 (1976-01-01), Philipp
patent: 4062140 (1977-12-01), Meyer
patent: 4104818 (1978-08-01), Hrabik

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