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 |
