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天津煤矿专用设备厂职工为满足煤矿生产对煤电钻的需要,通过一年的努力,制成了加工煤电钻外壳各孔的双工位组合机床,投产两年
In order to meet the need of coal power drill for coal mine production, workers of Tianjin Coal Mine Special Equipment Factory made a double-station combination machine tool for processing holes of coal drill shell through one year’s efforts.