高转速螺旋钻进钻机在松软突出煤层中的应用研究

doi:10.11799/ce201709025

COAL ENGINEERING ›› 2017, Vol. 49 ›› Issue (9): 94-96.doi: 10.11799/ce201709025

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High speed spiral drilling rig in the application of soft coal seams

Received:2016-11-27 Revised:2017-01-09 Online:2017-09-25 Published:2018-04-18

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High speed spiral drilling rig in the application of soft coal seams

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