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ROCK-BREAKING MEMBER FOR DRILLING MINE SHAFTS AND LARGE-DIAMETER WELLS
ROCK-BREAKING MEMBER FOR DRILLING MINE SHAFTS AND LARGE-DIAMETER WELLS
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机译:钻探矿井和大直径井的破岩成员
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1.породоразрушающий body for drilling large diameter wells and mining guns, including забурник corps and шарошками retractor with little by little располож енными шарошками,the породоприемник establis
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