37 Construction services, namely, construction of buildings, facilities, utilities, infrastructures; consultancy in the field of building construction; building demolition services; advisory services relating to building demolition; demolition of buildings; rental of construction machinery; rental of construction equipment; rental of tools, plants and equipment for construction, demolition, cleaning and maintenance; extraction of natural resources, namely, extraction of natural gas and oils; installation of public service infrastructures under construction, namely, roads, bridges, tunnels, toll booths, trains, train stations, bus stations, vehicle service stations, airports, airport terminals, airport runways, air traffic control; installation services for scaffolds and platforms for work and building; electrical installation services, namely, installation of electrical systems; building exterior and interior cleaning services; repair and maintenance of buildings in case of demolition; consultancy services relating to the repair of buildings; information services relating to the construction of buildings; maintenance and repair of residential buildings; maintenance and repair of installations in buildings; maintenance and repair of equipment in buildings; installation, maintenance and repair of elevators and lifts; building sealing services; road paving; installation and maintenance of digital signage and audio visual products sold therewith; road maintenance; rental of road building machinery; maintenance and repair of road construction machines; repair or maintenance of mechanical systems for car parks; installation and maintenance of pipelines; installation of gas pipelines; services for the repair of channels, namely the repair of water channels; repair of sanitary installations; installation of ventilation and dust extraction systems; installation, maintenance and repair of alarms and security systems; fire alarm installation and repair; maintenance and repair of fire alarm systems; installation of sewer pipes; installation of apparatus for supplying and distribution of gas; maintenance of water supply installations; installation of telecommunication networks; laying electric networks; cleaning services, namely, cleaning of buildings; street cleaning; cleaning of industrial premises air duct cleaning services, storage tank cleaning; septic tank cleaning; waste disposal, namely, waste cleaning services; repair, maintenance and refueling of vehicles; maintenance and repair of land vehicles; maintenance of vehicle washing installations; cleaning of vehicles; washing of vehicles; services for disinfection, extermination and control of pests, other than for agriculture, aquaculture, horticulture and forestry; mining extraction services; quarrying services