| 11. | First sound film : " Broadway Melody " ( 1929 ).
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| 12. | She was also a screenwriter for both silent and sound films.
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| 13. | With the beginning of sound films, Androschin focussed on documentary films.
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| 14. | It was one of the earliest full sound films produced there.
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| 15. | Proctor had sound equipment installed two years later for the new sound films.
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| 16. | In 1936, Philippine sound films in Spanish began to be produced.
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| 17. | The success of sound films stimulated the search for new applications of photocells.
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| 18. | In 1930 a sound film version in English was released internationally.
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| 19. | It was built in 1917 by silent and sound film star Charlie Chaplin.
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| 20. | His research and inventions were primarily concerned with sound film technology.
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