DuPont Vitacolor
Original Technical Papers and Primary Sources
U.S.P. 1,810,180
Secondary Sources
Anonymous (1932): Der einschichtige subtraktive Zweifarbenfilm. In: Die Kinotechnik, 14,18, Sep., pp. 335–336. (in German) View Quote
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Patents
U.S.P. 1,810,180 (Kelley, William V. D.; filed Dec. 12, 1922; granted June 16, 1931)
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