Apparatus for heating oil wells and pumping oil therefrom,申请号US19460639124-传众专利搜索

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发明名称	Apparatus for heating oil wells and pumping oil therefrom
摘要
申请公布号	US2444754(A)	申请公布日期	1948.07.06
申请号	US19460639124	申请日期	1946.01.04
申请人	STEFFEN RALPH M	发明人	STEFFEN RALPH M.
分类号	E21B36/00	主分类号	E21B36/00
代理机构		代理人
主权项
地址

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