Roller cutter bit with fluid flushed bearings,申请号US19500196023-传众专利搜索

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发明名称	Roller cutter bit with fluid flushed bearings
摘要
申请公布号	US2661932(A)	申请公布日期	1953.12.08
申请号	US19500196023	申请日期	1950.11.16
申请人	HUGHES TOOL COMPANY	发明人	WOODS HENRY B.
分类号	E21B10/24;E21B21/00	主分类号	E21B10/24
代理机构		代理人
主权项
地址

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