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METHOD OF PREVENTING SUDDEN COAL AND GAS OUTBURSTS WHEN EXCAVATING COAL IN DEVELOPMENT WORKINGS
METHOD OF PREVENTING SUDDEN COAL AND GAS OUTBURSTS WHEN EXCAVATING COAL IN DEVELOPMENT WORKINGS
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机译:在开发工作中采煤时防止突发的煤和瓦斯的方法
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.the invention относитс to mining industry and improves the efficiency of предотврашени sudden release during drilling wells diameter equal or more 300 mm, from the operational,контрол выбросоопасн
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