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发明名称
SICHERHEITSVENTIL FUER EIN OFFSHORE- BOHRLOCH
摘要
申请公布号
DE2711870(A1)
申请公布日期
1977.10.06
申请号
DE19772711870
申请日期
1977.03.18
申请人
SCHLUMBERGER TECHNOLOGY CORP.
发明人
L. MCGILL,HOWARD;JUN.,ERVIN RANDERMANN;J. MUSIK,OLGIERD
分类号
E21B29/08;E21B34/00;E21B34/04;F16K5/06;(IPC1-7):E21B33/035
主分类号
E21B29/08
代理机构
代理人
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