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Servo control
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International Business Machines Corporation
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Giovanni Cherubini
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G11 - INFORMATION STORAGE
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3472949
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Patent number 3,472,949
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Issue date Oct 14, 1969
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G11 - INFORMATION STORAGE
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3351718
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G11 - INFORMATION STORAGE
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3271514
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G11 - INFORMATION STORAGE
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G11 - INFORMATION STORAGE
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G11 - INFORMATION STORAGE
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G11 - INFORMATION STORAGE