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一种保径环及其制备方法和应用

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  • Release time:2021-08-02

  • School Sign:中南大学

  • Type of Patent:Invent

  • State of Patent:Authorized patents

  • Application Number:CN201810770406.6

  • Service Invention or Not:no

  • Application Date:2018-07-13

  • Publication Date:2018-11-20

  • Authorization Date:2019-12-27

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