Assignee

SCIENCE ACADEMY OF CHINA UNIV OF MINING

CN·1 granted patent·2 citations·filing 2015–2015

Technology mixE21B1 E21F1

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0153US10577891B2Using horizontal directional drilling and liquid nitrogen cyclic freeze-thaw process to improve permeability in gas drainageSCIENCE ACADEMY OF CHINA UNIV OF MINING·Filed 2015·Granted Mar 3, 2020·2 cites·3 claims

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