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502机周永昌班为了防止下降钻具时钻具摘钩事故,改进了提引钩,使用结果证明,效果良好,并节省了辅助工作时间。
502 machine Zhou Yongchang classes in order to prevent drill down when drilling tools to remove hook accident, improve the hook to mention, the results show that the effect is good, and save the auxiliary working hours.