Improvements in pit props,申请号GB19500018618-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	GB676581(A)	申请公布日期	1952.07.30
申请号	GB19500018618	申请日期	1950.07.26
申请人	HENRY HEWITT;JAMES HEWITT	发明人
分类号	E21D15/20	主分类号	E21D15/20
代理机构		代理人
主权项
地址

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