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  1. 1
    Research on Gas Extraction Technology of Directional Long Borehole in Ultrathick Coal Seam

    Research on Gas Extraction Technology of Directional Long Borehole in Ultrathick Coal Seam by Yaobin Li, Tao Jiang, Xin Guo

    Published 2022-01-01
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  2. 2
    Research on Optimization of Key Areas of Drainage Borehole Sealing in Ultrathick Coal Seam

    Research on Optimization of Key Areas of Drainage Borehole Sealing in Ultrathick Coal Seam by Xin Guo, Sheng Xue, Yaobin Li, Chunshan Zheng, Linfang Xie

    Published 2021-01-01
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