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发明名称
IMPROVEMENTS IN OR RELATING TO ROTARY DRILL BITS
摘要
申请公布号
EP0219992(A3)
申请公布日期
1987.08.05
申请号
EP19860307465
申请日期
1986.09.30
申请人
NL PETROLEUM PRODUCTS LIMITED
发明人
BARR, JOHN DENZIL;FULLER, JOHN;TAYLOR, MALCOLM ROY
分类号
E21B10/26;E21B10/56;E21B10/567;E21B10/60;(IPC1-7):E21B10/60
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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