Improvements relating to polygonal and arched structures for use in mining,申请号GB19510012729-传众专利搜索

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发明名称	Improvements relating to polygonal and arched structures for use in mining
摘要
申请公布号	GB722508(A)	申请公布日期	1955.01.26
申请号	GB19510012729	申请日期	1951.05.30
申请人	FRIEDRICH WILHELM MOLL	发明人
分类号	E21D11/24	主分类号	E21D11/24
代理机构		代理人
主权项
地址

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