Roof supports for coal mines,申请号GB19410001361-传众专利搜索

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发明名称	Roof supports for coal mines
摘要
申请公布号	GB550650(A)	申请公布日期	1943.01.19
申请号	GB19410001361	申请日期	1941.10.24
申请人	DAVID JOHN MORRISSEY	发明人
分类号	E21D15/48	主分类号	E21D15/48
代理机构		代理人
主权项
地址

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