Front projection device

Details Front projection device Front projection device

1981-11-12

1984-02-14

Holtje, Nelson C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1602

Patent

active

D02726327

REFERENCES:
patent: 2727427 (1955-12-01), Jenkins
patent: 2772600 (1967-12-01), Walker
patent: 2934601 (1960-04-01), Oppenheimer
patent: 3227509 (1966-01-01), Baker
patent: 3322487 (1967-05-01), Renner
patent: 3920320 (1975-11-01), Ellis
patent: 4018519 (1977-04-01), Clapp
patent: 4079393 (1978-03-01), Marachy
patent: 4264168 (1981-04-01), Baliozian

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