A rock drilling machine (1) comprising a drilling portion (4) and a string portion (6), and where the rock drilling machine (1) between the drilling portion (4) and the string portion (6) is provided with a steering joint (8).
申请公布号
WO2009148323(A1)
申请公布日期
2009.12.10
申请号
WO2009NO00201
申请日期
2009.05.29
申请人
NORWEGIAN HARD ROCK DRILLING AS;HAUGHOM, PER, OLAV;HAUGHOM, SIGURD, KJELL