Self-advancing mine roof supports,申请号US19610081835-传众专利搜索

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发明名称	Self-advancing mine roof supports
摘要
申请公布号	US3197965(A)	申请公布日期	1965.08.03
申请号	US19610081835	申请日期	1961.01.10
申请人	ELECTRO-HYDRAULIES LIMITED	发明人	LEE ROGER DEMANT;HAROLD ROBERT EDWIN
分类号	E21D23/00	主分类号	E21D23/00
代理机构		代理人
主权项
地址

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