Overhead projector

Details Overhead projector Overhead projector

1983-04-29

1985-11-26

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02815060

REFERENCES:
patent: D164293 (1951-08-01), Fitzgerald
patent: D182374 (1958-03-01), Miller
patent: D189655 (1961-01-01), Armbruster
patent: D219071 (1970-10-01), Ainslie
patent: D219072 (1970-10-01), Ainslie
patent: D219624 (1970-12-01), Ainslie
patent: D221901 (1971-09-01), Patla
patent: D229780 (1974-01-01), Ishida
patent: D244602 (1977-06-01), Mango
patent: 3762809 (1973-10-01), Kato
patent: 3951535 (1976-04-01), Altman

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