In-the-hole drill inner tube rod,申请号US19910759264-传众专利搜索

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发明名称	In-the-hole drill inner tube rod
摘要
申请公布号	US5174395(A)	申请公布日期	1992.12.29
申请号	US19910759264	申请日期	1991.09.13
申请人	INCO LIMITED	发明人	POTVIN, GERALD J.
分类号	E21B17/00	主分类号	E21B17/00
代理机构		代理人
主权项
地址

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