... 2.shaftdrilling(井筒钻凿) 103 shaftdeepening立井开凿... 1.slotted(钻凿的) ...
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... 开采程度垂下lift:level interving 矿井延深shaftdeepening 采区准备preparine indistrict ...
protective cover for shaftdeepening 竖井延深保护盘
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