A new or improved pit prop,申请号GB19290000229-传众专利搜索

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发明名称	A new or improved pit prop
摘要
申请公布号	GB326901(A)	申请公布日期	1930.03.27
申请号	GB19290000229	申请日期	1929.01.03
申请人	JOHN SPENCER LIMITED;KENVYN JOHN DANIEL JONES	发明人
分类号	E21D15/52	主分类号	E21D15/52
代理机构		代理人
主权项
地址

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