Building materials not of metal, namely, cement mixes, Portland cement, roofing cement, hydraulic cement, mortars, mortar mix; stone for building and construction, tar-based concrete and asphalt patching compounds, tiles of clay, glass, gypsum, ceramic or earthenware for walls, floors and ceilings; granite, marble, lumber, bricks, wood and concrete beams, planks, non-metal suspended ceiling systems comprising panels; non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments not of metal

Building construction, Building restoration, Construction of railroads and subways, streets and motorways, airports and ports, bridges, viaducts and tunnels, dams, hydraulic and hydroelectric projects, namely, water reservoirs, spillways, wells, river diversion tunnels, water pumping stations, water collection tunnels, pressure pipelines, penstocks, sluices, shafts, canals, intake structures, turbines, pumps, generators, power plants, civil buildings, hospitals and industrial construction complexes in the public and private sectors; repairing of railroads and subways, streets and motorways, airports and ports, bridges, viaducts and tunnels, dams, hydraulic and hydroelectric projects, namely, water reservoirs, spillways, wells, river diversion tunnels, water pumping stations, water collection tunnels, pressure pipelines, penstocks, sluices, shafts, canals, intake structures, turbines, pumps, generators and powerplants, civil buildings, hospitals and industrial construction complexes in the public and private sectors; installation services for elevators, lifts, windows, doors, walls, air handling units, generators, appliances and cooling towers, plumbing equipment, lightning systems, electrical systems, fire systems, sanitary fittings, flooring, ceiling systems, roofs in connection with railroads and subways, streets and motorways, airports and ports, bridges, viaducts and tunnels, dams, hydraulic and hydroelectric projects, namely, water reservoirs, spillways, wells, river diversion tunnels, water pumping stations, water collection tunnels, pressure pipelines, penstocks, sluices, shafts, canals, intake structures, turbines, pumps, generators and powerplants, civil buildings, hospitals and industrial construction complexes in the public and private sectors

Treatment of building materials, namely, processing, finishing and polishing of stone articles and glass; treatment of wood building materials for preservation purposes, namely, processing, finishing and polishing of wood; recycling of waste and trash

Scientific and technological services, namely, research and design for utility, industrial and commercial companies and governments in the field of architectural and structural engineering design pertaining to railroads and subways, streets and motorways, airports and ports, bridges, viaducts and tunnels, dams, hydraulic and hydroelectric projects and powerplants, civil buildings, hospitals and industrial construction complexes; industrial research for utility, industrial and commercial companies and governments in the field of architectural and structural engineering design pertaining to railroads and subways, streets and motorways, airports and ports, bridges, viaducts and tunnels, dams, hydraulic and hydroelectric projects and powerplants, civil buildings, hospitals and industrial construction complexes; and industrial analysis for utility, industrial and commercial companies and governments, namely, consultation in the field of architectural and structural engineering design pertaining to railroads and subways, streets and motorways, airports and ports, bridges, viaducts and tunnels, dams, hydraulic and hydroelectric projects and powerplants, civil buildings, hospitals and industrial construction complexes; design and development of hardware and software