Audio-visual projector

Details Audio-visual projector Audio-visual projector

1977-03-07

1979-08-14

Burke, Wallace R.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1602

Patent

active

D02526310

REFERENCES:
patent: D209636 (1967-12-01), Busch
patent: D224447 (1972-07-01), Catalano et al.
patent: D227599 (1973-07-01), Wisgin
patent: 3981573 (1976-09-01), Schwartz
patent: 4012133 (1977-03-01), Burton

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