Perfectionnements aux, ou se rapportant à des soutènements de plafonds dans les mines,申请号FR19620915878-传众专利搜索

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发明名称	Perfectionnements aux, ou se rapportant à des soutènements de plafonds dans les mines
摘要
申请公布号	FR1339342(A)	申请公布日期	1963.10.04
申请号	FR19620915878	申请日期	1962.11.19
申请人	W. E. & F. DOBSON LIMITED	发明人
分类号	E21D15/54;E21D23/04	主分类号	E21D15/54
代理机构		代理人
主权项
地址

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