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发明名称
TIEFBOHRVORRICHTUNG
摘要
申请公布号
DE3125013(A1)
申请公布日期
1982.03.25
申请号
DE19813125013
申请日期
1981.06.25
申请人
VARCO INTERNATIONAL INC.
发明人
I. BOYADJIEFF,GEORGE;A.R. PICARD,JOSEPH
分类号
E21B19/00;E21B3/02;E21B15/00;E21B19/02;E21B19/14;(IPC1-7):E21B4/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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