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METHOD OF WINNING COAL AT STEPPED-ROOF FACE
METHOD OF WINNING COAL AT STEPPED-ROOF FACE
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机译:台阶式采煤方法
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摘要
the invention относитс to coal industry and is дл develop thin steep coal seams, hazardous газодинамическим влени м, потолкоуст ойчивым забо м. the purpose of изобретени - improved security clean-
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