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经营范围
发明名称
ELECTRIC SURFACE CONTROLLED SUBSURFACE VALVE SYSTEM.
摘要
申请公布号
GB2249118(A)
申请公布日期
1992.04.29
申请号
GB19910025450
申请日期
1991.11.29
申请人
* OTIS ENGINEERING CORPORATION
发明人
DONALD HERBERT * PERKINS;THOMAS M * DEATON;PHILIP S * SIZER
分类号
E21B34/00;E21B34/06
主分类号
E21B34/00
代理机构
代理人
主权项
地址
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