Improvements relating to pit props,申请号GB19290018477-传众专利搜索

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发明名称	Improvements relating to pit props
摘要
申请公布号	GB332026(A)	申请公布日期	1930.07.17
申请号	GB19290018477	申请日期	1929.06.15
申请人	ARCHIBALD BAIRD & SON, LIMITED;HARRY ARCHIBALD BAIRD	发明人
分类号	E21D15/24	主分类号	E21D15/24
代理机构		代理人
主权项
地址

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