发明名称 EARTH DRILLING DEVICE
摘要 The invention relates to an earth drilling device (1) for boring a borehole into the soil and/or for drawing a line (9) into an underground passage, comprising at least one system line (4, 6) extending from the earth drilling device to a start region, wherein the system line is designed in an electrically insulating manner.
申请公布号 US2012087738(A1) 申请公布日期 2012.04.12
申请号 US201013254562 申请日期 2010.03.03
申请人 PUETTMANN FRANZ-JOSEF;VOELKEL GERHARD;GRASS PETER;RAMEIL MEINOLF;TRACTO-TECHNIK GMBH & CO. KG 发明人 PUETTMANN FRANZ-JOSEF;VOELKEL GERHARD;GRASS PETER;RAMEIL MEINOLF
分类号 E21B7/20 主分类号 E21B7/20
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