4.31 Manually Electrically Welded Steel Fabrications
4.32 Steel and Other Metal Fabrication Welding by Automated Machine
4.33 Manufacturing of Welded Fabrications (see also Field 5 for machining them)
4.34 Parts of Vehicles Components of Chassis and Upper Structures NOT for Mass-production
4.35 Manufacturing and Assembling of Vessels
4.36 Manufacturing of Containers and Their Components
4.37 Tube bending
4.38 Rolling