37 installation and maintenance of road equipment, installation of tolls, parking lots; maintenance of pipe systems, rehabilitation of aqueducts or water supply pipes, construction of sewerage works, of waste water drains, of rain purification works, and flood protection works, renovation of waterworks, and equipping existing water works so as to improve water supply security and quality, construction of drinking water plants and municipal or industrial waste water purification plants; construction of water treatment plants, drinking water plants, municipal and industrial waste water plants, rain water plants; execution of water piping and water treatment plants and drilling of shafts, works for the exploitation of water resources, installation and repair of irrigation systems; construction, repair and maintenance of heating plants, of electrical installations and electric power stations, of nuclear power stations, of petroleum plants, installation and maintenance of fuel pipelines and gas pipelines, works for the exploitation of geothermal resources, mining works, civil engineering, mining engineering, drilling of shafts, quarrying, electrical works, railway electrification services, installation and maintenance of electrical, heating, air conditioning, cooling apparatus, building insulation services; particularly heat, acoustic insulation; building works; renovation and maintenance of structures, buildings, rehabilitation of sites, structures, warehouses, real estate development services; public works, farm works, works for cleaning, restoration, rehabilitation of deteriorated sites; maintenance and cleaning of structures, of premises, of the floor, resurfacing of facades, disinfection, extermination of rats, of insects, services for cleaning of buildings, of city buildings, of civil engineering works, of underground works, of road facilities, of sites, of industrial premises, outer surface cleaning and blasting; cleaning of water conduits, of industrial installations, high-pressure cleaning of underground works, road cleaning services; building services, construction of buildings, of structures, of factories, of offices, of hotels, of civil engineering works, of underground works, of bridges, supervision and management of building construction and maintenance works, rental of building machinery, installation and repair of warehouses, consulting concerning building, demolition of structures, installation of scaffolding, building insulation services, paint, plaster, plumbing work, rental of building machines, installation and repair of elevators, cleansing and repair of rubbish chutes, installation and repair of fire alarm systems, of burglar alarm systems, consulting services concerning repair, execution of road paving, sand blasting, renovation of roadways, of motorways, of road facilities, of airport runways, construction of roads, of motorways, of road facilities, of airport runways, quarrying, mining, road cleansing services; installation, repair and maintenance of telephones, of telecommunication terminals, of telecommunication equipment and hardware, information services concerning the installation, repair and maintenance of telecommunication terminals; consulting services concerning construction of drinking water plants and municipal or industrial waste water purification plant; consulting services concerning execution of water piping and water treatment plants; consulting services concerning building, engineering and contracting, prime contracting for building works; installation and repair of air conditioning apparatus; maintenance of park areas