7 Electric arc welding apparatus; Electric plasma cutters; Electric screwdrivers; Industrial surface treatment equipment, namely, plasma treatment systems comprised of a high frequency, high voltage generator, treating heads and nozzles and structural parts therefor; Industrial surface treatment equipment, namely, vacuum plasma treatment systems comprised of a high frequency, high voltage generator, controls, and treatment chamber and structural parts therefor; Plasma cutting machines; Plasma etching machines; Soldering apparatus, electric; Soldering apparatus, gas-operated; Welding apparatus, gas-operated