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US2743763A
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Apparatus for joining the ends of magnetic sound tape
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US2404761A
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Method of producing bridging matrix for endless sound bands
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Method of synchronizing the pictures and the sound of independently arranged picture-and needle-sound-reproduction devices
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US2302160A
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Process of producing duplicate sound bands
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US2352052A
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Method of producing sound band matrices
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Elem container for endless films
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US2297517A
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Art of producing sound films
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US2274570A
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Process for producing sound films and matrix therefor
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US2273916A
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Installation for mechanically recording sound on endless tapes coated with wax
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Sound recorder for sound tapes
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US2305800A
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Process for the duplication of sound recording tapes
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US2297271A
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Galvanoplastic multiplication of sound record bands
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