Coal Engineering ›› 2025, Vol. 57 ›› Issue (5): 64-69.doi: 10. 11799/ ce202505009

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Application of milling and fishing string technology for pneumatic directional drilling in broken soft coal seam#br#

weifeng yang   

  • Received:2024-06-13 Revised:2024-08-28 Online:2025-05-13 Published:2025-07-03
  • Contact: weifeng yang E-mail:408844603@qq.com