Improvements in arches for supporting sides and roofs of headings and tunnels in mines and like places,申请号GB19310031770-传众专利搜索

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发明名称	Improvements in arches for supporting sides and roofs of headings and tunnels in mines and like places
摘要
申请公布号	GB380294(A)	申请公布日期	1932.09.15
申请号	GB19310031770	申请日期	1931.11.16
申请人	FERDINAND RICHARDS	发明人
分类号	E21D11/22	主分类号	E21D11/22
代理机构		代理人
主权项
地址

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