Railway fixed equipment . sleeper screws with seating for flat - bottom rails 铁路固定设备.平轨用带垫枕木螺钉
Railway fixed equipment . sawing and drilling of flat - bottom rails of types superior or equal to 26 kg m , of 60 g , 70 g grooved rails and their fischplates 铁路固定设备.大于kg m的g g形平底轨及其鱼尾板的切割和钻孔