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用于锚杆杆身减震耗能的拼接单元及自减震耗能的锚杆，实用新型专利，专利号ZL201921106454.1，2020年4月。排名第一

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  • Release time:2020-11-10

  • Type of Patent:Utility models

  • State of Patent:Authorized patents

  • Service Invention or Not:no

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