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US1874154A
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Electrically driven system of instruments through keyboard and pedals
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GB295468A
|
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Improvements in and relating to a combination of musical instruments electrically operated by means of keyboard and pedals
|
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GB271126A
|
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Improvements relating to the control of electric orchestral instrument of the organ type
|
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US1637674A
|
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Electric musical recorder
|
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US1620711A
|
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Perforating apparatus
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GB223842A
|
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Improvements in or relating to music recording devices
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GB221880A
|
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Improvements in or relating to music recording devices
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GB219148A
|
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Improvements in or relating to music recording devices
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