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Programmable logic controller
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Patent number 4,178,634
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Issue date Dec 11, 1979
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Automation Systems Inc.
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Peter G. Bartlett
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G05 - CONTROLLING REGULATING
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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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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