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发明名称
Anordning ved fleksibelt stigerör
摘要
申请公布号
NO177543(C)
申请公布日期
1995.10.04
申请号
NO19910003824
申请日期
1991.09.30
申请人
NORSK HYDRO AS
发明人
ASKESTAD, SIGMUND
分类号
E21B19/00;(IPC1-7):E21B17/01;B63B35/44
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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