Overhead projector

Details Overhead projector Overhead projector

1996-11-12

1998-08-11

Hyder, Philip S.

Photography and optical equipment

Projector or viewer

Overhead or opaque type

1602

Patent

active

D03968715

REFERENCES:
patent: D197258 (1963-12-01), Highbrger
patent: D344533 (1994-02-01), Hasegawa
patent: D349715 (1994-08-01), Darland
patent: D350361 (1994-09-01), Hasegawa
patent: 5092672 (1992-03-01), Vanderwerf
National Audio Video Supply Catalog, p. 62 (3M Overhead Projectors) 1994.

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