A new or improved prop for mines,申请号GB19300021357-传众专利搜索

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发明名称	A new or improved prop for mines
摘要
申请公布号	GB353676(A)	申请公布日期	1931.07.30
申请号	GB19300021357	申请日期	1930.07.15
申请人	WILLIE ARTHUR BEECH;JOHN JAMES STALEY	发明人
分类号	E21D15/18	主分类号	E21D15/18
代理机构		代理人
主权项
地址

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