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1
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UN-MANNED WORKING FACE MINING THCHNOLOGY IN DEEPLY INCLINED MIEDIUM TO THICK COAL SEAMS |
Pn Qinglin
ShAndong Provincia Coal Industry Bureau Guo Zhongping, Yong Youling, Shandong Institute of Mining & TechnologyGene Xianwen, Shandong Edutotional Institute of Coal Technology
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《China Coal》
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1997 |
0 |
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