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瓦斯抽采钻孔群区域性裂隙场二次注浆封堵装置及方法

  • Release time:2020-10-30
  • Hits:
  • Affilication of Author(s): 

    安全工程学院
  • Disigner of the Invention: 

    linboquan
  • Type of Patent: 

    国内
  • State of Patent: 

    专利授权
  • Application Number: 

    201210505101.5
  • Number of Inventors: 

    2
  • Service Invention or Not: 

    no
  • Application Date: 

    2012-12-03
  • Authorization Date: 

    2015-10-21
  • First Author: 

    LI Qingzhao