metal pipe fittings; fittings of metal for pipes; stainless steel; steel pipes; stainless steel pipes; steel sheets; stainless steel in sheet form; water tanks of metal; pressure gas cylinders made of metal; metal storage tanks; gas storage tanks of metal; tanks of metal; liquefied gas storage tanks of metal; fabricated metal components for building foundations; steel constructions; steel structures; ducts of metal for ventilating and air-conditioning installations; metal pipes; pipework of metal

construction of steel structures; installation of water pipes; installation of fire prevention equipment; installation of fire-extinguishing apparatus; construction; pipeline construction and maintenance