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经营范围
发明名称
A hydraulic drill string device, in particular a hydraulic in-hole rock drilling machine
摘要
申请公布号
AU2004223480(A1)
申请公布日期
2004.10.07
申请号
AU20040223480
申请日期
2004.03.16
申请人
WASSARA AB
发明人
FREDRIK EGERSTROM
分类号
E21B4/14;(IPC1-7):E21B4/14;B25D9/00
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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