Early theater film-sound
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|Radio talking moving pictures Jun, 1922
||Making movies speak Apr, 1923
||Sound projection III Apr, 1930
|Sound picture recording Apr, 1930
||Talking movies Jun, 1930
||Modern sound projection VI Jul, 1930
|Film-sound discs Jun, 1931
||3rd dimension in music May, 1934
||Controlled theater sound Sep, 1935
|Talkies fidelity III Dec, 1936
||Theater sound-new era May, 1937
||Sound-on-film studio II Jan, 1938
|16 MM audio May, 1938
||Stereo on film Jul, 1940
||FANTASOUND Feb, 1941
|Filmgramaphone Jun, 1941
||Sound-on-film Dec, 1941
||Embossing sound on film Jun, 1946