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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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3881172
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Patent number 3,881,172
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Issue date Apr 29, 1975
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G06 - COMPUTING CALCULATING COUNTING
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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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3827030
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Patent number 3,827,030
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Issue date Jul 30, 1974
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G05 - CONTROLLING REGULATING
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3798612
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Patent number 3,798,612
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Issue date Mar 19, 1974
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G05 - CONTROLLING REGULATING
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3761882
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Patent number 3,761,882
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Issue date Sep 25, 1973
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G05 - CONTROLLING REGULATING