Roof support assembly suitable for use in mines,申请号US19650455540-传众专利搜索

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发明名称	Roof support assembly suitable for use in mines
摘要
申请公布号	US3264945(A)	申请公布日期	1966.08.09
申请号	US19650455540	申请日期	1965.05.13
申请人	DOWTY MINING EQUIPMENT LIMITED	发明人	BOLTON DOUGLAS HERBERT HEWLETT;PAWLING FRANK;POTTS MICHAEL CHARLES
分类号	E21D23/26	主分类号	E21D23/26
代理机构		代理人
主权项
地址

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