Improvements in or relating to releasable supports for roofs in underground mines,申请号GB19490019197-传众专利搜索

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发明名称	Improvements in or relating to releasable supports for roofs in underground mines
摘要
申请公布号	GB684403(A)	申请公布日期	1952.12.17
申请号	GB19490019197	申请日期	1949.07.21
申请人	NORMAN JAMES MUSCHAMP;FRANK COWLISHAW	发明人
分类号	E21D15/60	主分类号	E21D15/60
代理机构		代理人
主权项
地址

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