6
Common metals and their alloys; Building materials of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; locks (other than electric) of metal, small items of metal hardware; pipes and tubes of metal; safes; ores; inks, anvils, bells; building materials of metal; laminates and castings; rails and other materials of metal for railway tracks; chains (except transmission chains for vehicles); cassettes; balls of steel; metal horseshoes; nails and screws; Metal shapes; joinery products of aluminium; reinforcing materials for building purposes (of metal); wire cloth; pipes of metal; bars for metal railings; armoured plating; tiles of metal for building; tile floorings of metal; hinge bands of metal; ducts of metal for ventilation installations; fences of metal; partitions of metal; roof coverings of metal
11
Apparatus for ventilating and smoke-extraction purposes; installation of ventilation and smoke-extraction apparatus; air-purifying apparatus and machines; air filters; air filtering installations
19
Building materials (non-metallic); reinforcing materials, not of metal, for building; Building stone; natural and artificial stone, cement, lime, mortar, plaster and gravel; concrete; pipes of earthenware or of cement; products for the construction of roads; asphalts; pitch and bitumen; transformable homes, except prefabricated, mobile and/or moveable buildings; monuments of stone; chimneys; roofs formed from panels of assembled glass; glass roofs/partitions; porches; supports and drainage components for glass panels; window glass, for building; drain pipes, not of metal; wall tiles, not of metal, for building; tile floorings, not of metal; building panels, not of metal; girders, not of metal; ducts, not of metal, for ventilation installations; fences, not of metal; partitions not of metal; roof coverings, not of metal
37
Construction of buildings; construction information; painting, plastering, plumbing, roofing; public works, rural works; rental of tools or construction equipment, rental of bulldozers and tree uprooting equipment; maintenance or cleaning of buildings, premises, floors (resurfacing and repointing of façades, disinfecting, rat exterminating)
42
Engineering, professional consultancy and construction drafting, non-business; architectural consultation; engineering drawing; technical research; engineering work (except for construction); prospecting; material testing; laboratories; scientific and industrial research