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METHOD AND MACHINERY UNIT FOR COAL MINING
METHOD AND MACHINERY UNIT FOR COAL MINING
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机译:煤矿开采的方法和机械装置
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1.method добьми угл , engaging with the вентил ционной, transport and разрезной вьфаботок with subsequent отбойкой угл in the lava and the roof of l and h and yu s and with whatin order to увеличен
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