Well drilling structure,申请号US19290386468-传众专利搜索

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发明名称	Well drilling structure
摘要
申请公布号	US1891062(A)	申请公布日期	1932.12.13
申请号	US19290386468	申请日期	1929.08.16
申请人	SAGER JOHN L	发明人	SAGER JOHN L.
分类号	E21B4/12	主分类号	E21B4/12
代理机构		代理人
主权项
地址

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