Journal of Liaoning Petrochemical University
Development of the AdjustableAngle Bend Drill Pipe
Zhang Guowei， Su Shanlin， Hao Rongming， Wang Xin
Journal of Liaoning Petrochemical University . 2014, (2): 65 -68 .  DOI: 10.3696/j.issn.1672-6952.2014.02.017

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