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公开(公告)号:US4278137A
公开(公告)日:1981-07-14
申请号:US49407
申请日:1979-06-18
摘要: An apparatus consisting of pipe sections pivotally joined which can be insert in a borehole when in straight position and manipulated to a zigzag position to loosen minerals outside the wall of the borehole.
摘要翻译: 由弯曲连接的管段组成的装置,当处于直线位置并且被操纵到锯齿形位置时,该部分可插入钻孔中以松开钻孔壁外的矿物。