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GB386983A
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Improvements relating to the reproduction of sounds from records
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GB389493A
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Method of and apparatus for, synchronizing sound and picture films
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GB384659A
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Means and method of testing and correcting defects in picture films
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GB371902A
|
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Improvements relating to the production of talking picture films
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GB347347A
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Method of producing sound and picture-image films for kinematographs
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GB343910A
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Process for the production of sound and picture records
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GB340566A
|
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Method for the production of sound records for mechanical sound reproduction
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DE567934C
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Adjustment device for radio receivers
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