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发明名称
ROTARY DRAG BIT
摘要
申请公布号
AU590826(B2)
申请公布日期
1989.11.16
申请号
AU19870069985
申请日期
1987.03.13
申请人
SMITH INTERNATIONAL, INC.
发明人
GEORGE FYFE;KENNETH WILLIAM JONES
分类号
E21B10/50;E21B10/52;E21B10/56;E21B10/567;E21B10/62;(IPC1-7):E21B10/10
主分类号
E21B10/50
代理机构
代理人
主权项
地址
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