Railway fixed equipment . thermit welding of rails . approval of a process 铁路固定设备.钢轨的热剂焊.工艺批准
2.
Railway fixed equipment . thermit welding of rails . welds performed by compagnies . performance and acceptance conditons of works 铁路固定设备.钢轨热剂焊.由compagnies执行的焊接.工程特性和验收条件