Heater for oil well tubing,申请号US19490074904-传众专利搜索

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发明名称	Heater for oil well tubing
摘要
申请公布号	US2561249(A)	申请公布日期	1951.07.17
申请号	US19490074904	申请日期	1949.02.07
申请人	EDWARD R. TOMLINSON	发明人	TOMLINSON DARRELL E.
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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