Oil well pumping and flowing apparatus,申请号US19300481242-传众专利搜索

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发明名称	Oil well pumping and flowing apparatus
摘要
申请公布号	US1811381(A)	申请公布日期	1931.06.23
申请号	US19300481242	申请日期	1930.09.11
申请人	BERWICK ROBERT E	发明人	BERWICK ROBERT E.
分类号	E21B34/06	主分类号	E21B34/06
代理机构		代理人
主权项
地址

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