Rotary drill bit apparatus,申请号US19490086161-传众专利搜索

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发明名称	Rotary drill bit apparatus
摘要
申请公布号	US2545037(A)	申请公布日期	1951.03.13
申请号	US19490086161	申请日期	1949.04.08
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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