A new or improved temporary roof support particularly for use in mines,申请号GB19470003350-传众专利搜索

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发明名称	A new or improved temporary roof support particularly for use in mines
摘要
申请公布号	GB639129(A)	申请公布日期	1950.06.21
申请号	GB19470003350	申请日期	1947.02.04
申请人	ETHEL RIDGILL;ROBERT PEARCE	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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