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Multitrack recorder
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Patent number 8,792,310
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Issue date Jul 29, 2014
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TEAC Corporation
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Ikuomi Natori
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Digital data record
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Patent number 4,571,713
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Issue date Feb 18, 1986
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News Log International, Inc.
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Richard Ackerman
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G06 - COMPUTING CALCULATING COUNTING
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2536664
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Patent number 2,536,664
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Issue date Jan 2, 1951
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G11 - INFORMATION STORAGE