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发明名称
ROTARY DRILL BIT
摘要
申请公布号
AU539781(B2)
申请公布日期
1984.10.18
申请号
AU19810076601
申请日期
1981.10.19
申请人
CHRISTENSEN INC.
发明人
RAINER JURGENS
分类号
E21B10/42;E21B10/43;E21B10/46;E21B10/56;E21B10/567;(IPC1-7):E21B10/46;E21B10/60
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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