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Distributed input/output system
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Patent number 4,870,564
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Issue date Sep 26, 1989
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GE Fanuc Automation North America, Inc.
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William J. Ketelhut
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G06 - COMPUTING CALCULATING COUNTING
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Distributed input/output system
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Patent number 4,764,868
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Issue date Aug 16, 1988
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General Electric Co.
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William J. Ketelhut
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G06 - COMPUTING CALCULATING COUNTING
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3686639
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Patent number 3,686,639
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Issue date Aug 22, 1972
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G05 - CONTROLLING REGULATING