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经营范围
发明名称
OVERVAAKINGSANORDNING
摘要
申请公布号
NO173754(B)
申请公布日期
1993.10.18
申请号
NO19870004411
申请日期
1987.10.22
申请人
WOOD GROUP DRILLING & PROD
发明人
JOHNSON NICHOLAS SHANE
分类号
E21B17/02;E21B17/18;E21B47/01;E21B47/06;F16L41/02;(IPC1-7):E21B49/00
主分类号
E21B17/02
代理机构
代理人
主权项
地址
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