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发明名称
Rolling cone bit
摘要
申请公布号
GB2314870(B)
申请公布日期
2000.09.27
申请号
GB19970023609
申请日期
1997.04.10
申请人
* SMITH INTERNATIONAL INC
发明人
GARY RAY * PORTWOOD;GARY EDWARD * GARCIA;JAMES CARL * MINIKUS;PER IVAR * NESE;DENNIS * CISNEROS;CHRIS EDWARD * CAWTHORNE
分类号
E21B10/16;E21B10/52;E21B10/56;E21B10/567;(IPC1-7):E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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