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Self-drilling differential grouting combined bolt and anchoring method therefor
- Release time:2021-04-12
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School Sign:
许国安Type of Patent:
PCT or foreign applicationsState of Patent:
Authorized patentsAuthorization number:
US10794183B2Number of Inventors:
1Service Invention or Not:
yesApplication Date:
2018-08-28Authorization Date:
2020-10-06
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