Machines and machine parts, namely machines and structural parts thereof to produce heat and increase the transfer of heat and radiation; machines and structural parts thereof to increase the efficiency of internal heat in order to increase the production of energy; machines and structural parts thereof for catalytic conversion; machines and structural parts thereof to recover internal heat within a catalytic system; catalyst tube used in a fired multitubular reactor for the production of heat or internal heat, namely, pneumatic tube conveyors; crude oil refining machines; boiler tubes, namely, pneumatic tube conveyors; power operated blowers for the suction, compression and transport of gases; heat exchangers being parts of machines

Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes, namely, lighting fixtures, HVAC units, cooking ovens, refrigerators and ventilation hoods; heat accumulators; steam accumulators; acetylene burners; acetylene generators; hot air space heating apparatus; air cooling apparatus; air filtering installations; air reheaters, namely, electric space heaters; electric air driers; feeding apparatus being structural parts of heating boilers; structural plates sold as parts of ovens; coolers being structural parts of furnaces; gas burners, oil burners for industrial use and alcohol burners; gas burners; burners for lamps; apparatus for loading being structural parts of furnaces; platforms for loading being structural parts of furnaces; air valves for steam heating installations; heating apparatus for solid, liquid or gaseous fuels; heating installations; distillation columns not for scientific purposes; gas condensers, other than parts of machines; air quality control installations, namely, air purifiers; control and safety accessories for gas pipes, namely, pressure regulators for gas installations; heating elements; distillation apparatus not for scientific purposes; heat exchangers not being parts of machines; gas scrubbing apparatus; cooling evaporators; air filters for industrial installations; furnaces, except for experimental furnaces; shaped fittings being structural parts of furnaces; furnace grids being structural parts of furnaces; induction ovens, except for experimental ovens; refrigerating apparatus and machines, namely, refrigerators; control and safety accessories for gas apparatus, namely, pressure regulators for gas installations; steam generators other than parts of machines; cooling installations for water; industrial refining towers for distillation; water heaters; heat regenerators, namely, heat accumulators; cooling apparatus and facilities, namely, air cooling apparatus; pressurized water purification tanks; level controlling valves in tanks, namely, steam valves; coils as parts of distilling, heating or cooling installations; safety accessories for water or gas apparatus and pipes, namely, pressure regulators for gas and water installations; boiler pipes for heating installations, namely, pipes for heating boilers; flare stacks for use in the oil industry; steam generating installations; heating installations for the petro-chemical, petroleum and gas industries; refinery heaters and refinery burners, namely, heating installations; industrial gas burners; gas burners for industrial furnaces; burner assemblies, namely, brackets for gas burners; air gas mixing devices for burners and air heating systems comprised primarily of ducts, pipes, and heater manifolds through which heated air or gaseous streams pass or circulate being structural parts of gas burners and heating installations