Microfilm viewer

Details Microfilm viewer Microfilm viewer

1981-04-24

1983-09-20

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1603

Patent

active

D02706440

REFERENCES:
patent: D210702 (1968-04-01), Karow
patent: D212561 (1968-10-01), Simpson
patent: D220657 (1971-05-01), Christoffersen
patent: D239873 (1976-05-01), Matwey
patent: D244934 (1977-07-01), Hauser
patent: D247178 (1978-02-01), Kubnick
patent: D264850 (1982-06-01), Hall
patent: 3560083 (1971-02-01), Browncombe

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