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一种机械密封环表面动压泵送槽的成型方法

Date:2019-10-23  Hits:

  • Type of Patent:发明
  • State of Patent:已失效
  • Authorization number:200910031987.2
  • Service Invention or Not:no
  • Application Date:2009-06-26
  • Authorization Date:2011-06-01
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