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Detachable embedded punching drill bit special for coal punching
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Drilling rod seal assembly and drilling system
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Colliery gas drainage adapter and colliery gas drainage hole sealing device
CHEN LONG, ZHANG ZHIFENG, WANG MIAN, REN PEILIANG, LI WENJIA, LI SHUWEN, SU BENQUAN, CHEN LIN
Year of Publication 30.03.2016
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