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一种分段式模块化抗大变形和抗冲击组合锚杆及其组装方法
- Release time:2021-04-12
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许国安Type of Patent:
InventState of Patent:
Authorized patentsAuthorization number:
ZL201610286697.2Number of Inventors:
1Service Invention or Not:
noApplication Date:
2016-05-03Authorization Date:
2017-11-03