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发明名称
Improvements in drag bits
摘要
申请公布号
GB2108554(A)
申请公布日期
1983.05.18
申请号
GB19820029692
申请日期
1982.10.18
申请人
* SMITH INTERNATIONAL INC
发明人
HARRY NORRIS * BALL
分类号
E21B10/56;E21B10/567;(IPC1-7):E21B10/46
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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