Electric oil well tubing heater,申请号US19460668843-传众专利搜索

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发明名称	Electric oil well tubing heater
摘要
申请公布号	US2525314(A)	申请公布日期	1950.10.10
申请号	US19460668843	申请日期	1946.05.10
申请人	RIAL THOMAS A	发明人	RIAL THOMAS A.
分类号	E21B36/04	主分类号	E21B36/04
代理机构		代理人
主权项
地址

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