Improvements relating to a method and apparatus for mining,申请号GB19480032014-传众专利搜索

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发明名称	Improvements relating to a method and apparatus for mining
摘要
申请公布号	GB654868(A)	申请公布日期	1951.07.04
申请号	GB19480032014	申请日期	1948.12.10
申请人	ARNOLD HAARMANN	发明人
分类号	E21C27/42	主分类号	E21C27/42
代理机构		代理人
主权项
地址

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