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一九五五年八月我们在大同矿务局二矿进行生产实习时发现截煤机生产率低，不能很好完成正规循环。通过实际观察和测定，我们认为：除劳动组织外，主要原因有二：第一，截煤机在工作时，由於截齿质量不好，需经常更换，根据测定，平均截割１５公尺左右换齿一次，每次需时２０～
In August 1955, when we conducted production internship at No. 2 Mine of Datong Mining Bureau, we found that the coal cutter’s productivity was low and the formal cycle was not well done. Through the actual observation and measurement, we think: Except for labor organization, there are two main reasons: First, the coal cutter at work, due to poor quality pick, need to be replaced frequently, according to the determination, the average cut about 15 meters Change the teeth once, each time takes 20 ~