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发明名称
IMPROVEMENTS IN OR RELATING TO ROTARY DRILL BITS
摘要
申请公布号
EP0314953(B1)
申请公布日期
1993.03.03
申请号
EP19880116983
申请日期
1985.07.08
申请人
CAMCO DRILLING GROUP LIMITED
发明人
FULLER, JOHN
分类号
E21B10/56;E21B10/567;E21B10/60
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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