Pit prop,申请号GB19510005896-传众专利搜索

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发明名称	Pit prop
摘要
申请公布号	GB684063(A)	申请公布日期	1952.12.10
申请号	GB19510005896	申请日期	1951.03.12
申请人	DE DIRECTIE VAN DE STAATSMIJNEN IN LIMBURG	发明人
分类号	E21D15/28	主分类号	E21D15/28
代理机构		代理人
主权项
地址

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