 This short was released in connection with the 20th anniversary of Warner Brothers  first exhibition of the Vitaphone sound-on-film process on 6 August 1926. The film highlights  Thomas A. Edison  (qv) and  Alexander Graham Bell  (qv) s efforts that contributed to sound movies and acknowledges the work of  Lee De Forest  (qv). Brief excerpts from the August 1926 exhibition follow. Clips are then shown from a number of Warner Brothers features, four from the 1920s, the remainder from 1946/47.