7 Welding, brazing, soldering, gouging, cleaning, scarfing, flame cutting, and other metal treatment machines and apparatus, namely, electric arc cutting apparatus, cutting torches, welding torches, underwater welding torches, underwater cutting torches, gas operated plumbing torches, gas operated blow torches, gas operated welding guns, valves as machine components for welding and cutting equipment, flash back arrestors as machine components for welding and cutting torches; parts and fittings for welding machines, namely, welding tips, welding nozzles, welding valves, welding hoses and welding manifolds, excluding lathes