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															Testing Technology of Hydraulic Caving Effect in Coal Seam Based on Stress 
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															Study and application of joint support of anchorage cable and cable beam in steep inclined "Three Soft" coal seam roadway
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															Research on Goaf Gas Control using of L-shaped Well in 1301 Mining Face of Hudi Coal Mine
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															The design and application of the gas extraction in two level mining of coal reservoir
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															Gas Control Research in Short Distance Coal Seams in Songhe Coal Mine, Guizhou
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