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Line 75: ===Origins=== ~~In early~~Early [[minicomputer]]s were used in the control of industrial processes since the beginning of the 1960s. The [[IBM 1800 Data Acquisition and Control System\|IBM 1800]], for example, was an early computer that had input/output hardware to gather process signals in a plant for conversion from field contact levels (for digital points) and analog signals to the digital ___domain. The first industrial control computer system was built 1959 at the Texaco Port Arthur, Texas, refinery with an [[TRW Inc.#Semiconductors and computers\|RW-300]] of the [[TRW Inc.\|Ramo-Wooldridge]] Company.<ref>{{cite journal

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