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METHOD OF MINING COAL FROM STEEP AND STEEPLY INCLINED SEAMS
METHOD OF MINING COAL FROM STEEP AND STEEPLY INCLINED SEAMS
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机译:急倾斜煤层的开采方法
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1.method добычиугля of steep and крутонаклонных reservoirs, including the preparatory developing below уровн stratum, drilling in the layer of нагнетательн s and the production wells.through the wate
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