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Upper Corners of A Gassy Fully-mechanized Top-coal Caving

The Technique for the Drainage of the Gas from the Upper Corners of A Gassy Fully-mechanized Top-coal Caving Face through Drilling Vertical Holes

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Influence of gas extraction on oxidation zone in goaf for fully-mechanized top-coal caving face In order to solve the problems that gas emission quantity


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CN100999997A Dec 31, 2006 Jul 18, 2007 () Method for drawing-out near layer gas of top-coal caving faceCN100999997A * Dec