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发明名称
Preform cutting elements for rotary drill bits
摘要
申请公布号
GB2338007(A)
申请公布日期
1999.12.08
申请号
GB19990011920
申请日期
1999.05.24
申请人
* CAMCO INTERNATIONAL
发明人
TERRY RICHARD * MATTHIAS
分类号
E21B10/54;E21B10/55;E21B10/56;E21B10/567;E21B10/573;E21B10/60;(IPC1-7):E21B10/56
主分类号
E21B10/54
代理机构
代理人
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