2512 Manufacture of doors and windows of metal

25.12.1 Doors, windows and their frames and thresholds for doors, of metal
25.12.10 Doors, windows and their frames and thresholds for doors, of metal
25.12.9 Sub-contracted operations as part of manufacturing of doors and windows of metal
25.12.99 Sub-contracted operations as part of manufacturing of doors and windows of metal