Electric arc welding apparatus; Electric arc welding machines; Electric welding machines; Electric wet grinders for welding electrodes; Electrodes for welding machines; Gas-operated welding machines; Gas welding guns; Gas welding machines; Laser welding machines; Metal welding machines, namely, saws and cutters; Valves being engine parts for introducing fuel-air mixtures into the combustion chambers of internal combustion engines; Welding apparatus, gas-operated; Welding electrodes; Welding m...