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METHOD OF PREVENTING TREATMENT OF SHOCK- AND OUTBURST-HAZARDOUS COAL SEAMS WITH UNSTABLE CLAYEY ROOFS
METHOD OF PREVENTING TREATMENT OF SHOCK- AND OUTBURST-HAZARDOUS COAL SEAMS WITH UNSTABLE CLAYEY ROOFS
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机译:用不稳定的黏土顶面预防电击和突伸出煤层的方法
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摘要
the invention относитс to mountain industrial, and m. b. used in the prevention and treatment of удароопасных выбросоопасных coal with volatile слоистыми clay layers in a tree вле. the objective is t
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