Railway fixed equipment . sleeper screws with seating for flat - bottom rails 鐵路固定設(shè)備.平軌用帶墊枕木螺釘
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 鐵路固定設(shè)備.大于kg m的g g形平底軌及其魚尾板的切割和鉆孔