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Noncontact mechanical seal
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Patent number 5,121,931
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Issue date Jun 16, 1992
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Tanken Seiko Kabushiki Kaisha
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Mitsuyoshi Matsushita
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Mechanical seal including a split seal ring
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Patent number 5,067,733
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Issue date Nov 26, 1991
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Tanken Seiko Kabushiki Kaisha
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Yataro Nagai
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Fluid agitator
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Patent number 5,066,134
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Issue date Nov 19, 1991
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Tanken Seiko Kabushiki Kaisha
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Hiroshi Ohbori
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Fluid agitator
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Patent number 4,982,373
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Issue date Jan 1, 1991
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Tanken Seiko Kabushiki Kaisha
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Yataro Nagai
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Mechanical seal
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Patent number 4,196,911
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Issue date Apr 8, 1980
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Tanken Seiko Corp.
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Mitsuyoshi Matsushita
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...