Improvements in and relating to machines for the mining of coal and the like,申请号GB19470018168-传众专利搜索

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发明名称	Improvements in and relating to machines for the mining of coal and the like
摘要
申请公布号	GB628671(A)	申请公布日期	1949.09.02
申请号	GB19470018168	申请日期	1947.07.09
申请人	ARTHUR BOLTON	发明人
分类号	E21C27/12	主分类号	E21C27/12
代理机构		代理人
主权项
地址

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