Improvements in or relating to roof supports for underground mines,申请号GB19520018056-传众专利搜索

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发明名称	Improvements in or relating to roof supports for underground mines
摘要
申请公布号	GB748868(A)	申请公布日期	1956.05.16
申请号	GB19520018056	申请日期	1952.07.17
申请人	NORMAN JAMES MUSCHAMP;FRANK COWLISHAW	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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