Roller drilling bit,申请号US19330651912-传众专利搜索

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发明名称	Roller drilling bit
摘要
申请公布号	US2013839(A)	申请公布日期	1935.09.10
申请号	US19330651912	申请日期	1933.01.16
申请人	PICKIN ROWLAND O	发明人	PICKIN ROWLAND O.
分类号	E21B10/08	主分类号	E21B10/08
代理机构		代理人
主权项
地址

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