Improvements in mine props,申请号GB19470018515-传众专利搜索

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发明名称	Improvements in mine props
摘要
申请公布号	GB629422(A)	申请公布日期	1949.09.20
申请号	GB19470018515	申请日期	1947.07.11
申请人	EDMOND BAILY	发明人
分类号	E21D15/40	主分类号	E21D15/40
代理机构		代理人
主权项
地址

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