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Research and application of sequence optimization  of close distance coal seam mining in  Ningwuzhuangwang mining area
Fan Xueqiang 1, Xing Yong 2
1. Shanxi Ningwu Dayun Huasheng Zhuangwang Coal Industry Corporation Ltd., Xinzhou 036700, China; 2. Shandong Chenlong Energy Group Corporation Ltd., Tengzhou 277500, China


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