GB440861A
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Improved method and device for the mechanical recording of sound or other oscillations
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GB434895A
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Improvements in or relating to the mechanical production of oscillation tracks, particularly sound tracks on carriers
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DE639644C
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Device for regulating the zero position of the recording element in systems for the mechanical recording of vibrations, especially tones
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GB432988A
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Improvements in or relating to the recording of oscillations on a carrier
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GB422818A
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Improvements in or relating to the mechanical recording of oscillations
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GB437720A
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Improvements in or relating to the mechanical recording of oscillations, particularly sound oscillations, on a carrier
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GB421503A
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Improvements in the copying of sound records
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DE632831C
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Device for the mechanical production of a vibration track, in particular a sound track
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DE670369C
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Sound recording carrier and method for recording sound vibrations on a carrier
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DE710729C
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Method of making an optically reproducible mechanical sound recording
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