Oil-well heater,申请号US19280305096-传众专利搜索

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发明名称	Oil-well heater
摘要
申请公布号	US1776997(A)	申请公布日期	1930.09.30
申请号	US19280305096	申请日期	1928.09.10
申请人	DOWNEY PATRICK V	发明人	DOWNEY PATRICK V.
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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