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Ball valve assembly
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Patent number 4,411,407
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Issue date Oct 25, 1983
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Asahi Yukizai Kogyo Co., Ltd.
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Youichi Ninomiya
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Check valve assembly
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Patent number 4,286,622
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Issue date Sep 1, 1981
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Youichi Ninomiya
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Butterfly valve assembly
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Patent number 4,266,754
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Issue date May 12, 1981
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Asahi Yukizai Kogyo Co., Ltd.
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Youichi Ninomiya
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...