Well drilling tool,申请号US19390286213-传众专利搜索

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发明名称	Well drilling tool
摘要
申请公布号	US2206222(A)	申请公布日期	1940.07.02
申请号	US19390286213	申请日期	1939.07.24
申请人	MARTHA H. WRIGHT	发明人	CREIGHTON THOMAS A.;MCMAHAN THOMAS E.
分类号	E21B10/04;E21B25/10;E21B47/00	主分类号	E21B10/04
代理机构		代理人
主权项
地址

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