Bearing destroyer for rock bit cutters,申请号US19410381554-传众专利搜索

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发明名称	Bearing destroyer for rock bit cutters
摘要
申请公布号	US2261501(A)	申请公布日期	1941.11.04
申请号	US19410381554	申请日期	1941.03.03
申请人	JOSHUA C. CONRAD	发明人	LORE ARTHUR B.
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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