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Thrust bearing
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Patent number 4,639,146
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Issue date Jan 27, 1987
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Hitachi, Ltd.
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Masahiro Yoshioka
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Mechanical seal
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Patent number 4,296,935
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Issue date Oct 27, 1981
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Hitachi, Ltd.
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Hiroshi Inouye
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Mechanical seal
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Patent number 4,294,453
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Issue date Oct 13, 1981
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Hitachi, Ltd.
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Hiroshi Inouye
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Fluid-tight closure apparatus
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Patent number 4,239,124
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Issue date Dec 16, 1980
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Hitachi, Ltd.
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Hiroshi Inouye
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Mechanical seal
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Patent number 4,103,907
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Issue date Aug 1, 1978
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Hitachi, Ltd.
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Hiroshi Inouye
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...