Improvements in roof supports for use in mines,申请号GB19440025279-传众专利搜索

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发明名称	Improvements in roof supports for use in mines
摘要
申请公布号	GB584220(A)	申请公布日期	1947.01.09
申请号	GB19440025279	申请日期	1944.12.16
申请人	MAVOR & COULSON, LIMITED;JOHN BRIDIE MAVOR	发明人
分类号	E21D23/00	主分类号	E21D23/00
代理机构		代理人
主权项
地址

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