Early TV: "The Story of Television" 1956 RCA David Sarnoff Vladimir Zworykin

more at http://showbiz.quickfound.net/ "RCA's corporate history of pre-1956 developments in television." The film features David Sarnoff and Vladimir Zworykin.

Public domain film from the Library of Congress Prelinger Archive, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and equalization.