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发明名称
DRAG TYPE DRILLING BIT
摘要
申请公布号
GB2202877(A)
申请公布日期
1988.10.05
申请号
GB19880006680
申请日期
1988.03.21
申请人
* SMITH INTERNATIONAL INCORPORATED
发明人
KENNETH WILLIAM * JONES
分类号
E21B10/00;E21B10/54;E21B10/55;E21B10/56;E21B10/567;E21B10/60;(IPC1-7):E21B10/00
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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