Richardson's handbook of projection (1930)

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HANDBOOK OF PROJECTION FOR 1919— Joseph Engl, Germany. 1918— T. W. Case, U. S., and E. I. Sponable, U. S. Developed system of talking pictures very similar to DeForest and Case. 1925— J. Developed photo-electric cells recording lights and generally made commercial the present system of recording sound on film. P. Maxfield Later work on disc synchronized with film. Please let it be clearly understood that this list makes absolutely no claim to completeness, but only that these are the names of at least some of the known pioneers in the work. via