Maintenance and repair 94 Safety measures 77 Design and construction 71 Welding 62 Ships 55 Industrial safety 50 Automobiles 46 Boats and boating 45 Marine engineering 39 Naval architecture 35 Prevention 31 Hydrodynamics 30 Motors 30 Industrial and technical education 26 Shipbuilding 26 Boatbuilding 25 Malaysia 24 Management 24 Process control 24 Navigation 23 Data processing 21 Composite materials 20 Electric engineering 20 Electric equipment 20 Manufacturing processes 20 History 18 Woodworking tools 18 Stability of ships 17 Automation control systems 16 Machinery 16