Improvements relating to collapsible pit props,申请号GB19290038431-传众专利搜索

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发明名称	Improvements relating to collapsible pit props
摘要
申请公布号	GB335836(A)	申请公布日期	1930.10.02
申请号	GB19290038431	申请日期	1929.12.16
申请人	FRANCIS GRAHAM SHAND	发明人
分类号	E21D15/10	主分类号	E21D15/10
代理机构		代理人
主权项
地址

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