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Self-drilling differential grouting combined bolt and anchoring method therefor

  • Release time:2021-04-12
  • Hits:

  • School Sign: 

    许国安

  • Patent description: 

    澳大利亚发明专利

  • Type of Patent: 

    Invent

  • State of Patent: 

    Authorized patents

  • Authorization number: 

    2018331664

  • Number of Inventors: 

    1

  • Service Invention or Not: 

    no

  • Authorization Date: 

    2018-08-28
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