Tandem expansible rotary drill bit,申请号US19500137536-传众专利搜索

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发明名称	Tandem expansible rotary drill bit
摘要
申请公布号	US2654575(A)	申请公布日期	1953.10.06
申请号	US19500137536	申请日期	1950.01.09
申请人	KAMMERER ARCHER W	发明人	KAMMERER ARCHER W.
分类号	E21B10/34	主分类号	E21B10/34
代理机构		代理人
主权项
地址

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