Means of regulating flow of fluid within a well,申请号US19370137058-传众专利搜索

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发明名称	Means of regulating flow of fluid within a well
摘要
申请公布号	US2186488(A)	申请公布日期	1940.01.09
申请号	US19370137058	申请日期	1937.04.15
申请人	JOHNSTON	发明人	JOHNSTON MORDICA O.;BETTIS WILBUR F.
分类号	E21B43/12;E21B49/08	主分类号	E21B43/12
代理机构		代理人
主权项
地址

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