Switch

Details Switch Switch

1981-10-07

1984-06-19

Gandy, James M.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

Patent

active

D02743256

REFERENCES:
patent: D97905 (1935-12-01), Butler et al.
patent: D136455 (1943-10-01), Popp
patent: D136456 (1943-10-01), Popp
patent: D190175 (1961-04-01), Garnick
patent: 973982 (1910-10-01), Schoenberg
patent: 1959249 (1934-05-01), Perkins
patent: 1989747 (1935-02-01), Figueira
patent: 2212382 (1940-08-01), Wertzheiser

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