Oil well pumping assembly,申请号US19480043321-传众专利搜索

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发明名称	Oil well pumping assembly
摘要
申请公布号	US2519142(A)	申请公布日期	1950.08.15
申请号	US19480043321	申请日期	1948.08.09
申请人	SHELL DEVELOPMENT COMPANY	发明人	LEHR PAUL E.
分类号	E21B43/12	主分类号	E21B43/12
代理机构		代理人
主权项
地址

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