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Mining Upper Limit Improvement Present Situation and
 Development Trend in China
LI Jian-ping1, ZHOU Qi-mou2, LIU Jian-yu3, XIANF Xiao-ri2
1. Jinmei Group Linfen Jinniu Company, Linfen  041000, China; 2. Safety Engineering Institute, North China Institute of Science and Technology, Beijing  101601, China; 3. Technology Centre, China Coal Pingshuo Group Corporation Ltd., Shuozhou  036006, China


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