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发明名称
Flow diverter ring for a rotary drill bit and method
摘要
申请公布号
GB2329207(A)
申请公布日期
1999.03.17
申请号
GB19980022683
申请日期
1997.04.07
申请人
* DRESSER INDUSTRIES INC
发明人
MARK E * WILLIAMS
分类号
E21B10/22;E21B10/25;E21B21/00;(IPC1-7):E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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