Boring type continuous miner having three boring heads and method of mining,申请号US19630327466-传众专利搜索

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发明名称	Boring type continuous miner having three boring heads and method of mining
摘要
申请公布号	US3294450(A)	申请公布日期	1966.12.27
申请号	US19630327466	申请日期	1963.12.02
申请人	NATIONAL MINE SERVICE COMPANY	发明人	JR. JERRY KARLOVSKY,
分类号	E21C27/10	主分类号	E21C27/10
代理机构		代理人
主权项
地址

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