37 [ Direction and supervision of construction work, demolition of buildings, relocation of plants, namely, building construction and repair, building maintenance and repair, building of shops, building restoration, construction and renovation of buildings, construction and repair of buildings, construction supervision, electrical contracting,] electrical repairs and installation of motors and of heating apparatus, [ fire alarm installation and repair, furnace installation and repair, general construction contracting, installation and maintenance of burglar and/or fire alarms, installation of power generation and energy conversation units, installation of building insulation, installation of electrical and generating machinery, machinery maintenance and repair, maintenance and repair of heating installations, maintenance, repair, replacement and tuning of components, ] parts or systems in steam and gas turbine generators, [ rebuilding of power generation and power conversion engines, repair of buildings, repair or maintenance of boilers, repair or maintenance of chemical plants, repair or maintenance of chemical processing machines and apparatus,] repair or maintenance of electric motors, [repair or maintenance of fire alarms, repair or maintenance of industrial furnaces, repair or maintenance of machines and apparatus for pulp-making, papermaking or paper-working, repair or maintenance of metalworking machines and tools, repair or maintenance of mining machines and apparatus, ] repair or maintenance of power generators, [ repair work on buildings, roofing installation; dismantling and reassembly of plants, namely, construction consultation, construction supervision, consultation in building construction supervision, consulting services for the construction of water treatment and purification plants, solid waste treatment plants and other municipal infrastructure facilities, general construction contracting; rental of construction equipment; installation, ] repair and maintenance of [ boilers, burners, ] generation power and energy conversion units [, heating equipments, heating installations, condensing apparatus, steam condensers, radiators for motors and engines, air reheaters and boiler tubes, machinery, components, parts, or systems in steam and gas turbine generators, chemical plants, chemical processing machines and apparatus, drilling and pumping of oil machinery, fire alarms, industrial furnaces, power generators, railway rolling stocks, vehicles and apparatus for locomotion by air, rebuilding machines that have been worn or partially destroyed; installation, repair and maintenance of computers; custom and naval shipbuilding; cleaning and repair of boilers and heating systems; cleaning and repair of air-conditioning apparatus; installation and repair of electric apparatus in the nature of autoclaves, convection ovens, distillers for chemical processing, distilling units, electrochemical gas generators, energy storage plants, evaporators for chemical processing, furnace boilers, furnaces, heat exchangers for chemical processing, heat exchangers not being parts of machines, heating furnaces for industrial purposes, incinerators, induction ovens, industrial boilers, industrial furnaces, melting furnaces for industrial purposes, propellers for wind powered generators, solar collectors, solar heat collection panels, solar water heaters, steam accumulators, steam generators, steam heating apparatus for industrial purposes, steam superheaters for industrial purposes, steam valves, water desalination plants; underwater repair ]