[ Building materials, namely, steel, stainless steel, alloyed iron, copper ores and aluminum siding, all for use in building steam generating, heating and cooling systems and piping for vessels, reactors, heat exchangers and heating elements; and metal chimneys ]

[ Centrifugal pumps and motors for circulating fluids in steam generating systems and in heating and cooling systems ]

Electronic control mechanisms, namely, pressure and temperature gauges and sensors and electric control devices used to regulate steam generating and heating and cooling systems

Steam generators; industrial dryers for heating and dehumidifying; evaporative air coolers; ventilating exhaust fans; electric heating fans; thermal oil heaters fueled by oil, gas, and solid fuels in the nature of coal, tree bark, sawdust, wood chips, swarf, cane trash, peanut hulls and coffee grounds; heat exchangers not being parts of machines in which the source of heat is electric or an exhaust gas; hot gas generators for direct heating of dryers using gaseous, fluid and solid fuels, as well as combustible waste in solid form

[ Material processing, namely, metal forming and bending, milling, drilling, turning, grinding, cutting, chamfering and rolling of metal; and welding ]