Pumping well hook-off device,申请号US19380240499-传众专利搜索

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发明名称	Pumping well hook-off device
摘要
申请公布号	US2207937(A)	申请公布日期	1940.07.16
申请号	US19380240499	申请日期	1938.11.15
申请人	NEEL JAMES P	发明人	NEEL JAMES P.
分类号	F04B47/02	主分类号	F04B47/02
代理机构		代理人
主权项
地址

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