Perfectionnements apportés aux dispositifs de soutènement de toits utilisables dans les exploitations minières souterraine.,申请号BE19580573781-传众专利搜索

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发明名称	Perfectionnements apportés aux dispositifs de soutènement de toits utilisables dans les exploitations minières souterraine.
摘要
申请公布号	BE573781(A1)	申请公布日期	1959.04.01
申请号	BE19580573781	申请日期	1958.12.11
申请人	W.E. & F. DOBSON LIMITED	发明人
分类号	E21D17/02;E21D23/06;(IPC1-7):E21D	主分类号	E21D17/02
代理机构		代理人
主权项
地址

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