Transparency frame for overhead projector

Details Transparency frame for overhead projector Transparency frame for overhead projector

1981-12-07

1984-05-22

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02739593

REFERENCES:
patent: D234628 (1975-03-01), Hrabik
patent: D256023 (1980-07-01), Constantine
patent: D267181 (1982-12-01), Jost
patent: 2541575 (1951-02-01), Davidson
patent: 3537792 (1970-11-01), Furniss
patent: 3578858 (1971-05-01), LeMarr
patent: 4146985 (1979-04-01), Margulies

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