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发明名称
HEISEMEKANISME FOR BORERIGG.
摘要
申请公布号
NO822883(A)
申请公布日期
1983.03.01
申请号
NO19820002883
申请日期
1982.08.26
申请人
VARCO INTERNATIONAL, INC,
发明人
BOYADJIEFF, GEORGE I.,;CAMPBELL, ANDREW B.,
分类号
E21B19/08;E21B3/04;E21B15/00;E21B19/00;E21B19/07;E21B19/086;(IPC1-7):E21B/
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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