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GB496424A
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Improvements in sound films and recording processes and apparatus therefor
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US1997976A
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Film having a photographic sound record for preparing same
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US2094244A
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Sound reproducing film and a device for recording sounds photographically
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GB361367A
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Improvements in and relating to combined sound-recording and kinematograph cameras
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US1857569A
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Device for recording of sound
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US1931829A
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System for reproduction of sound by means of light-sensitive cells
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US1802065A
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Device for starting heavy rotary bodies adapted to secure uniform movement of films
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US1713918A
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System for reproducing sounds from distorted sound records
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GB257920A
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Improvements relating to the reproduction of sound
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US1747261A
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Sound reproduction
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GB236940A
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Improvements in method for recording sound waves on a photographic film
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GB248148A
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Process for the transmission of sound by electrical means and for recording and reproducing sound films
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GB249627A
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Improvements in means for controlling the speed of a film in cinematographic apparatus and the like
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GB221817A
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A method for compensating the sluggishness of selenium cells
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US1597819A
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Device for feeding acoustic films at constant speed
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GB217894A
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Improvements relating to supporting devices for mirrors for use in sound recording
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US1650092A
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Device for conversion of light variations into electrical currents
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US1580762A
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Reproduction of speaking films
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GB215731A
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Improvements relating to the reproduction of sound records
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US1581598A
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Recording means
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