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经营范围
发明名称
Bunnhull-boreenhet
摘要
申请公布号
NO983794(D0)
申请公布日期
1998.08.19
申请号
NO19980003794
申请日期
1998.08.19
申请人
BAKER HUGHES INC
发明人
FINCHER, ROGER W.
分类号
E21B4/00;E21B4/18;E21B21/08;E21B21/10;E21B44/00;(IPC1-7):E21B
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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