37 Building construction; repair, maintenance and installation of lighting installations, lightning protections and groundings, telecommunications equipment, heating, ventilating, cooling and sanitary installations, waste management systems, building security systems, building access systems, electronic automation of building systems, information technology systems and hardware, industrial machines and machine tools, sprinkler and fire extinguishing apparatus, highways and parking structures, rail systems, marine systems, and airports; plumbing repair work and installation of gas and water supplies; installation, maintenance and repair of infrastructural works in the nature of lighting installations, lightning protections and groundings, telecommunications equipment, heating, ventilating, cooling and sanitary installations, waste management systems, building security systems, building access systems, electronic automation of building systems, information technology systems and hardware, sprinkler and fire extinguishing apparatus, highways and parking structures, rail systems, marine systems, and airports; plumbing repair work and installation of gas and water supplies; installation and maintenance of telecommunications equipment, optical machines and instruments, weighing machines and apparatus, computer hardware, communication satellites, networking hardware, transformers, baluns, cables used in connection with computers, computer peripheral devices, televisions, audio video equipment, closed-circuit TV equipment and telecommunication equipment, switches, routers, sensor and power management devices, telephone, wireless hot spots, calculating machines, computer, data processing equipment, cash registers, fire extinguishers, telecommunications equipment, navigation apparatus, and apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; shipbuilding; construction, and installation and maintenance of off-shore installations; installation and maintenance of telecommunications networks and systems in the nature of optical machines and instruments, computer hardware, communication satellites, networking hardware, transformers, baluns, cables used in connection with computers, computer peripheral devices, televisions, audio-video equipment, closed-circuit TV equipment and telecommunication equipment, switches, routers, sensor and power management devices, telephones, wireless hot spots; technical consultancy in the field of repair, maintenance and installation of telecommunications equipment, lighting installations, lightning protections and groundings, telecommunications equipment, heating, ventilating, cooling and sanitary installations, waste management systems, building security systems, building access systems, electronic automation of building systems, information technology systems and hardware, sprinkler and fire extinguishing apparatus, highways and parking structures, rail systems, marine systems, and airports; plumbing work and installation of gas and water supplies