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发明名称
Roterende boresystem
摘要
申请公布号
NO982258(A)
申请公布日期
1998.05.18
申请号
NO19980002258
申请日期
1998.05.18
申请人
CAMCO DRILLING GROUP LTD
发明人
BARR, JOHN DENZIL;RUSSEL, MICHAEL KING
分类号
E21B4/02;E21B7/04;E21B7/06;E21B7/08;E21B41/00;E21B47/01;E21B47/022;E21B47/024;(IPC1-7):E21B
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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