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原苏联顿涅茨克煤矿机械设计院设计的K-20全断面掘进机,适用于有瓦斯和煤尘爆炸危险的矿井。在岩石硬度系数f=10时,该机可掘进荒断面
The K-20 full-face boring machine designed by former Donetsk Coal Mine Machinery Design Institute of the former Soviet Union is suitable for mines with danger of gas and coal dust explosion. In the rock hardness coefficient f = 10, the machine can be driven into the barren section