Electric arc cutting apparatus; Electric arc welding apparatus; Electric welding machines; Electric welding machines for metalworking; Electrodes for welding machines; Filters and purifiers for machines, namely, filters and purifiers for removing contaminants from gases used in the semiconductor industry; Laser welding machines; Oxy-acetylene welding and cutting machines; Plasma cutting machines; Soldering apparatus, electric; Welding apparatus, gas-operated; Welding torches