Balancing device for well pumps,申请号US19290339832-传众专利搜索

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发明名称	Balancing device for well pumps
摘要
申请公布号	US2050506(A)	申请公布日期	1936.08.11
申请号	US19290339832	申请日期	1929.02.14
申请人	THE OIL COUNTRY SPECIALTIES MFG. CO.	发明人	STANLEY FRED D.
分类号	F04B47/14	主分类号	F04B47/14
代理机构		代理人
主权项
地址

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