37 Building construction services; asphalting, bricklaying, renovation and restoration of buildings; carpentry, masonry, and refurbishment of buildings; refurbishment of buildings featuring the retrofitting of building structures; excavation services, namely, cable laying, drainage, dredging, and earthmoving; repair, installation and maintenance services in respect of vehicles, elevators and escalators, electrical and mechanical plants, industrial machineries, air conditioners; repair, installation and maintenance of electricity, heating, ventilation, air conditioning, refrigeration, plumbing, solid waste disposal, fire services, cabling and ducting systems and equipment, alarm and surveillance systems, and all mechanical and electrical works within a building; repair, installation and maintenance services relating to telecommunications and communications computers, electrical apparatus, office automation equipment, data processing equipment, audio, video and data recording and reproducing apparatus, broadcasting apparatus, calculating machines, computers, computer hardware, computer accessories and peripherals; installation of information technology cabling network and foundational fibre optic system apparatuses and equipment in buildings, and installation of computer hardware and computer hardware networking installations; installation of data processing apparatus, computers, and communication computers; maintenance of data processing apparatus, computers, and communication computers