Iron pit props,申请号GB19520031540-传众专利搜索

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发明名称	Iron pit props
摘要
申请公布号	GB720453(A)	申请公布日期	1954.12.22
申请号	GB19520031540	申请日期	1952.12.12
申请人	WILLI ZINDEL	发明人
分类号	E21D15/32	主分类号	E21D15/32
代理机构		代理人
主权项
地址

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