Oil well device,申请号US19370180392-传众专利搜索

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发明名称	Oil well device
摘要
申请公布号	US2397472(A)	申请公布日期	1946.04.02
申请号	US19370180392	申请日期	1937.12.17
申请人	CROWELL ERD V	发明人	CROWELL ERD V.
分类号	E21B33/12	主分类号	E21B33/12
代理机构		代理人
主权项
地址

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