metalworking machine tools; chemical processing machines and apparatus; plastic processing machines and apparatus; shafts, axles or spindles, machine elements other than land vehicles; bearings, machine elements not for land vehicles; shafts, couplings or connectors, machine elements not for land vehicles; power transmissions and gearing, machine elements not for land vehicles; 3D printers

repair or maintenance of consumer electric appliances; repair or maintenance of electric motors; repair or maintenance of chemical processing machines and apparatus; repair or maintenance of measuring and testing machines and instruments; repair or maintenance of power distribution or control machines and apparatus; repair or maintenance of power generators; repair or maintenance of metalworking machines and tools