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一种自钻式差异注浆组合锚杆及其锚固方法
- Release time:2020-10-30
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第一单位Type of Patent:
国内State of Patent:
专利授权Application Number:
201710815492.3Number of Inventors:
1Service Invention or Not:
noApplication Date:
2017-09-12Authorization Date:
2020-05-19First Author:
Guoan Xu
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