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Oil ring for internal combustion engine
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Patent number 9,353,864
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Issue date May 31, 2016
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Kabushiki Kaisha Riken
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Yunzhi Gao
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Solid polymer electrolyte fuel cell unit
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Patent number 6,972,162
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Issue date Dec 6, 2005
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Kabushiki Kaisha Riken
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Yunzhi Gao
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Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
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Composite sensor
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Patent number 6,471,840
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Issue date Oct 29, 2002
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Kabushiki Kaisha Riken
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Yunzhi Gao
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G01 - MEASURING TESTING
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Nitrogen oxide sensor
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Patent number 6,319,377
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Issue date Nov 20, 2001
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Kabushiki Kaisha Riken
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Masaharu Hasei
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G01 - MEASURING TESTING
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Gas sensor
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Patent number 6,303,011
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Issue date Oct 16, 2001
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Kabushiki Kaisha Riken
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Yunzhi Gao
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G01 - MEASURING TESTING