Improvements in pit props,申请号GB19490015468-传众专利搜索

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发明名称	Improvements in pit props
摘要
申请公布号	GB658716(A)	申请公布日期	1951.10.10
申请号	GB19490015468	申请日期	1949.06.10
申请人	ALEXANDER SCHUBERT	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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