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Double-plate rock bolt
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Orifice plate flowmeter
HE LEI, NIU DECAO, PI DAFENG, TIAN ZHEN, MENG QUANSHENG, ZHAO YANG, YANG KE, HUANG FANGQING, HAN JINTAI, ZHU JIANG, CAI DETING, LI GUOHUA, HUANG BENLU, LI YONGHUA
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