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发明名称
Improvements in or relating to rotary drill bits
摘要
申请公布号
GB9712342(D0)
申请公布日期
1997.08.13
申请号
GB19970012342
申请日期
1997.06.14
申请人
CAMCO INTERNATIONAL (UK) LIMITED
发明人
分类号
E21B10/54;E21B10/55
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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