Annular or arch-shaped mine roof or like supporting girder structures,申请号GB19500016413-传众专利搜索

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发明名称	Annular or arch-shaped mine roof or like supporting girder structures
摘要
申请公布号	GB709627(A)	申请公布日期	1954.06.02
申请号	GB19500016413	申请日期	1950.06.30
申请人	MARGOT VON LINSINGEN	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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