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GB468594A
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Improvements in devices for indicating the position of the recording or reproducing implement in the record groove of disc-talking machines
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GB467883A
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Improvements in or relating to disc-talking machines
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GB455599A
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Improvements in turntables for sound recording and reproducing machines
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GB455553A
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Improvements in sound recording and reproducing devices
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GB438485A
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Improvements in drives for sound recording and reproducing machines
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DE666676C
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Convertible drive for record recording and playback devices
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DE628126C
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Record speaking machine
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