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发明名称
A dual action valve including a biult in hydraulic circuit
摘要
申请公布号
EG21009(A)
申请公布日期
2000.09.30
申请号
EG19970000555
申请日期
1997.06.16
申请人
SCHLUMBERGER SEACO INC.
发明人
RITLEWSKI GARY
分类号
E21B;E21B34/00;E21B34/08;E21B34/10;(IPC1-7):E21B34/10
主分类号
E21B
代理机构
代理人
主权项
地址
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