Audio visual display system

Details Audio visual display system Audio visual display system

1984-10-15

1987-05-12

Ansher, Bernard

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D14 77, D14 72

Patent

active

D02897709

REFERENCES:
patent: D170882 (1953-11-01), McGunnigle
patent: D197742 (1964-03-01), Martinez et al.
patent: D244801 (1977-06-01), DeLand
patent: D249527 (1978-09-01), Stralka
patent: D252629 (1979-08-01), Evans, Jr.
patent: D252631 (1979-08-01), Dieckhoff
patent: D254254 (1980-02-01), Boje
patent: 3552845 (1971-01-01), Yates, Jr.
patent: 3626617 (1971-12-01), Frey

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