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METHOD OF UNDERGROUND MINING OF STEEP AND SLOPING MINERAL SEAMS
METHOD OF UNDERGROUND MINING OF STEEP AND SLOPING MINERAL SEAMS
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机译:矿山陡峭滑坡的地下开采方法
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摘要
the invention относитс to the case and to improve the security позвол ет clean-up and to increase the useful size loading chamber.the development of ore body 1 under the обводненными breeds 2 start w
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