Improvements in and relating to mining machines,申请号GB19290023991-传众专利搜索

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发明名称	Improvements in and relating to mining machines
摘要
申请公布号	GB337281(A)	申请公布日期	1930.11.06
申请号	GB19290023991	申请日期	1929.08.06
申请人	FREDERICK WILSON HURD	发明人
分类号	E21C25/50	主分类号	E21C25/50
代理机构		代理人
主权项
地址

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