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东北黄金地质勘探公司六队,通过对自脱式(爬杆的)提引器的改进,在使用钻杆胶箍的情况下,实现了塔上无人。自脱
Six teams from the Gold Prospecting Company of Northeast China realized that there was no one on the tower by using the drill pipe hoop through the improvement of the self-extracting (pole-climbing) lifter. Take off