Swiveled drill bit for cable tool drilling,申请号US19310568842-传众专利搜索

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发明名称	Swiveled drill bit for cable tool drilling
摘要
申请公布号	US1957476(A)	申请公布日期	1934.05.08
申请号	US19310568842	申请日期	1931.10.14
申请人	SLOAN ELGAN S	发明人	SLOAN ELGAN S.
分类号	E21B10/02;E21B27/00	主分类号	E21B10/02
代理机构		代理人
主权项
地址

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