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发明名称
Steigrohrverbindung fuer Erdoel- und Erdgassonden
摘要
申请公布号
DE1608271(B1)
申请公布日期
1970.10.29
申请号
DE19681608271
申请日期
1968.03.18
申请人
OEMV AG
发明人
FROEHLICH ING JOHANN
分类号
E21B17/02;F16L15/04;F16L15/06;(IPC1-7):E21B17/02
主分类号
E21B17/02
代理机构
代理人
主权项
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