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发明名称
VANNE DE SECURITE POUR PUITS PETROLIER
摘要
申请公布号
FR2555246(B2)
申请公布日期
1986.09.05
申请号
FR19830018463
申请日期
1983.11.21
申请人
PETROLES CIE FSE
发明人
PAUL HERDELE
分类号
E21B23/02;E21B34/00;E21B34/10;(IPC1-7):E21B33/12
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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