Oil well pumping apparatus,申请号US19340756495-传众专利搜索

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发明名称	Oil well pumping apparatus
摘要
申请公布号	US2017694(A)	申请公布日期	1935.10.15
申请号	US19340756495	申请日期	1934.12.07
申请人	HAMMETT DAVID M	发明人	HAMMETT DAVID M.
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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