Overhead projector

Details Overhead projector Overhead projector

1988-09-30

1991-06-18

Feifer, Melvin B.

Photography and optical equipment

Projector or viewer

Overhead or opaque type

Patent

active

D03176169

REFERENCES:
patent: D268592 (1983-04-01), Miller et al.
patent: D290264 (1987-06-01), Overman
patent: D305904 (1990-02-01), Matsumoto
patent: 4811110 (1989-03-01), Ohmura et al.
patent: 4921343 (1990-05-01), Ushiro et al.
patent: 4938587 (1990-07-01), Namioka et al.
patent: 4968134 (1990-11-01), Shimizu et al.

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