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Sequence control system
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Patent number 4,298,958
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Issue date Nov 3, 1981
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Hitachi, Ltd.
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Masaoki Takaki
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G05 - CONTROLLING REGULATING
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3908117
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Patent number 3,908,117
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Issue date Sep 23, 1975
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G06 - COMPUTING CALCULATING COUNTING
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3886528
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Patent number 3,886,528
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Issue date May 27, 1975
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G05 - CONTROLLING REGULATING
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3829842
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Patent number 3,829,842
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Issue date Aug 13, 1974
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G05 - CONTROLLING REGULATING
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3380033
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Patent number 3,380,033
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Issue date Apr 23, 1968
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G06 - COMPUTING CALCULATING COUNTING