Improvements in means for supporting the roofs of colliery workings and the like,申请号GB19290026115-传众专利搜索

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发明名称	Improvements in means for supporting the roofs of colliery workings and the like
摘要
申请公布号	GB334697(A)	申请公布日期	1930.09.11
申请号	GB19290026115	申请日期	1929.08.28
申请人	CHARLES DICKINSON	发明人
分类号	E21D11/30	主分类号	E21D11/30
代理机构		代理人
主权项
地址

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