Choke valve borehole indicating system,申请号US19420440405-传众专利搜索

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发明名称	Choke valve borehole indicating system
摘要
申请公布号	US2352833(A)	申请公布日期	1944.07.04
申请号	US19420440405	申请日期	1942.04.24
申请人	SHELL DEVELOPMENT COMPANY	发明人	HASSLER GERALD L.
分类号	E21B47/18	主分类号	E21B47/18
代理机构		代理人
主权项
地址

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