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经营范围
发明名称
BUSHING FOR A DRILLING RIG
摘要
申请公布号
EP1220971(A1)
申请公布日期
2002.07.10
申请号
EP20000962719
申请日期
2000.09.25
申请人
WEATHERFORD/LAMB, INC.
发明人
JAENSCH, MANFRED
分类号
E21B19/10;(IPC1-7):E21B19/10;E21B33/04
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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