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METHOD OF DEGASSING EXCAVATION FIELDS IN PILLAR MINING
METHOD OF DEGASSING EXCAVATION FIELDS IN PILLAR MINING
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机译:采煤场开挖场除气方法
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摘要
the invention относитс of mountain промьгашенности and is дл снижени газообильности falls () and повышени security mining gas вому factor.the purpose is to improve the effectiveness and efficiency
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