Access Restricted Archival objects in this container: Department of Building and Safety regarding O. A. Perry placed in charge of Multicolor Electrical, 1931 May 07 De Ferenes & Company regarding producing multicolor films, 1930 July 01 to 1931 August 31 Oscar B. Depue regarding sound printer illustration, 1930 August 13 Paul Dickey regarding screening films, 1931 May 25 to 1931 June 09 Dictograph Products Corporation regarding installation and coverage, 1930 September 10 to 1930 September 12 Dr. L. M. Dieterich regarding notes on multicolor process, improvement suggestions, and loan information, 1930 July 17 to 1932 January 12 Noah Dietrich regarding finances and personnel, 1930 July 03 to 1931 May 23 Noah Dietrich and Howard Hughes regarding advertising and finances, 1930