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隧道超前预报中防止炮孔坍塌的支撑清理装置及使用方法. 国家发明专利, ZL201811089090.0

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Title:隧道超前预报中防止炮孔坍塌的支撑清理装置及使用方法. 国家发明专利, ZL201811089090.0

Service Invention or Not:No

Release Time:2020-03-06

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