Drill rig for hard rock mining,申请号US19530361541-传众专利搜索

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发明名称	Drill rig for hard rock mining
摘要
申请公布号	US2765148(A)	申请公布日期	1956.10.02
申请号	US19530361541	申请日期	1953.06.15
申请人	PRINCE JR JOHN	发明人	JR. JOHN PRINCE,
分类号	E21B7/02	主分类号	E21B7/02
代理机构		代理人
主权项
地址

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