The research achievements were applied to the dip coal pillar area of No. 21 mining district, Qianqiu coal mine successfully.
经千秋煤矿21采区下山煤柱区现场应用，效果良好。
The research achievements were applied to the dip coal pillar area of No. 21 mining district, Qianqiu coal mine successfully.
经千秋煤矿21采区下山煤柱区现场应用，效果良好。
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