3311Repair and Maintenance of Manufactured Metal Products

repair of tanks, reservoirs, and metal containers or vessels; | repair and maintenance of pipes and pipelines; | mobile welding; | repair of steel shipping drums; | repair and maintenance of steam or other steam generators; | repair and maintenance of auxiliary machinery used in steam generators, such as condensers, heaters, collectors, and steam accumulators; | repair and maintenance of nuclear reactors, except isotope separators; | repair and maintenance of marine engine parts or steam power boilers; | repair and maintenance of radiator and central heating equipment; | repair and maintenance of firearms and cannons/artillery (including repair services for sports or recreational activities).