发明名称 Percussion drill head
摘要 The invention relates to a method for horizontal drilling with a percussion implement and a percussion head or percussion head element mounted in a movable manner relative to the percussion implement, the percussion impulse being transmitted in at least three steps.
申请公布号 US7093677(B2) 申请公布日期 2006.08.22
申请号 US20040471967 申请日期 2004.01.29
申请人 TRACTO-TECHNIK GMBH 发明人 HOFMANN FRANK
分类号 E02D29/00;E21B4/14;E21B7/26;E21B10/40 主分类号 E02D29/00
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