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PLC processor and PLC
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Patent number 5,233,697
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Issue date Aug 3, 1993
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Fanuc Ltd.
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Takashi Yamauchi
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G05 - CONTROLLING REGULATING
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Sequential control system
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Patent number 3,995,257
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Issue date Nov 30, 1976
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Nissan Motor Co., Ltd.
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Shunichi Iki
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G05 - CONTROLLING REGULATING
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3570006
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Patent number 3,570,006
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G06 - COMPUTING CALCULATING COUNTING
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Issue date Sep 27, 1966
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G06 - COMPUTING CALCULATING COUNTING