Mine arch supports,申请号US19530338799-传众专利搜索

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发明名称	Mine arch supports
摘要
申请公布号	US2801522(A)	申请公布日期	1957.08.06
申请号	US19530338799	申请日期	1953.02.25
申请人	DEUTSCHE KOHLENBERGBAN-LEITUNG	发明人	KUHN OTTO
分类号	E21D23/06	主分类号	E21D23/06
代理机构		代理人
主权项
地址

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