Mine roof bars,申请号GB19570016365-传众专利搜索

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发明名称	Mine roof bars
摘要
申请公布号	GB839211(A)	申请公布日期	1960.06.29
申请号	GB19570016365	申请日期	1957.05.23
申请人	LE PROGRES CHARBONNIER "PROCHAR" SOCIETE COOPERATIVE	发明人
分类号	E21D17/086	主分类号	E21D17/086
代理机构		代理人
主权项
地址

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