Microfiche

Details Microfiche Microfiche

1982-04-06

1984-09-18

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02755726

REFERENCES:
patent: 524301 (1894-08-01), Benedict
patent: 1801546 (1931-04-01), Enderle
patent: 3555713 (1971-01-01), Leinbach
patent: 3980402 (1976-09-01), Holliday
patent: 4225217 (1980-09-01), Smith

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