Oil well pump and counterbalance,申请号US19380196751-传众专利搜索

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发明名称	Oil well pump and counterbalance
摘要
申请公布号	US2244428(A)	申请公布日期	1941.06.03
申请号	US19380196751	申请日期	1938.03.18
申请人	O'LEARY CHARLES M	发明人	O'LEARY CHARLES M.
分类号	F04B47/00	主分类号	F04B47/00
代理机构		代理人
主权项
地址

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