gas welding machines; gas-operated soldering irons; gas-operated soldering apparatus; heating shield; gas welding guns; pneumatic tool transporters; air-pressure cutting machines; pneumatic hammers; air-pressure press machines; operation machines; fixing means for operation machines; hole punching machine; punching press for metalworking; refraction machines; grinder; hand-held power driven grinders; metal processing machines; machine tool holder for metal working; machine presses for metal w...