19
Building materials (non-metallic); non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal; distribution installations for any liquid, cold and hot, gas and energy, regulating and safety accessories for liquid and gas pipes; building materials, not of metal, paving stones; edging; kerb stones; railway sleepers; manhole covers; utility tunnels; prefabricated sheds (military and civil); coving; supporting walls; sidewalls; modular elements for waste collection centres, acoustic screens; cement slabs; chutes; slabs of concrete and cement; adduction elements for tanks and wells; branch boxes, not of metal, for pipework; devices not of metal for insemination and for diverting surface water and wastewater; bridge approaches, drainpipes, cantilever slabs; drainage slabs, storage partitions not of metal; tanks, not of metal: bridges and cornices, not of metal; prefabricated elements, not of metal, for basements; containers of radioactive waste, valves, beams, joists, posts, fences, counter registers, burial vaults
37
Installation of systems for the assembly of prefabricated concrete structures; construction, repair and installation of concrete floors, prefabricated cement blocks; assembly, repair and maintenance of pipeline networks, pipes, assembly of junctions and accessories for pipes carrying and supplying any cold or hot liquid, gas and energy; construction, repair and maintenance of tunnels; reconstructing, asphalting, draining and by-passing of surface water and wastewater systems; rental of construction equipment, scaffolding
42
Engineering; surveying; architectural consultancy; construction drafting; technical project studies; quality control