SUBSURFACE ANNULUS SAFETY VALVE,申请号GB19770011387-传众专利搜索

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发明名称	SUBSURFACE ANNULUS SAFETY VALVE
摘要
申请公布号	GB1539153(A)	申请公布日期	1979.01.31
申请号	GB19770011387	申请日期	1977.03.17
申请人	OTIS ENG CORP	发明人
分类号	E21B34/00;E21B34/10;(IPC1-7):E21B43/12	主分类号	E21B34/00
代理机构		代理人
主权项
地址

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