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发明名称
BORERIGG.
摘要
申请公布号
NO159303(C)
申请公布日期
1988.12.14
申请号
NO19810002045
申请日期
1981.06.17
申请人
VARCO INTERNATIONAL INC.
发明人
BOYADJIEFF, GEORGE I.;CAMPBELL, ANDREW B.
分类号
E21B33/04;E21B19/07;(IPC1-7):E21B7/20;E21B19/08
主分类号
E21B33/04
代理机构
代理人
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