在国内外一派大好形势下,一机部、冶金部于1974年6月12日至15日在鞍钢弓长岭铁矿召开了QZ—250型潜孔钻机鉴定会,对鞍钢矿山研究所、宣化风动机械厂和鞍钢弓长岭铁矿共同设计、试制和试验的QZ—250型潜孔钻机进行鉴定。参加这次会议的有冶金、矿山、机械制造、科研、设计单位及高等院校等39个单位的79名代表。会议期间,代表们学习了中央首长的有关批示和讲话,听取了设计、试制单位关于QZ In a good situation at home and abroad faction, a machine department, the Ministry of Metallurgical in June 12, 1974 to 15 in Gongchangling Iron Mine held a QZ-250 DTH drilling rig appraisal of the Anshan Institute of Mining, Xuanhua Fengzhu Machinery Plant and Anshan Iron and Steel Gongchangling co-design, trial production and test QZ-250 DTH drilling rig identification. Attending the meeting were 79 delegates from 39 units including metallurgy, mining, machinery manufacturing, scientific research, design institutes and institutions of higher learning. During the meeting, delegates learned about the instructions and speeches of the Central Executive Directorate and listened to the design and trial unit about QZ