Metal building elements for damping of sound, including attenuators, screens, louvres, barriers, enclosures, doors, mufflers and silencers; sound absorbing structures of metal for buildings, including attenuators, screens, louvres, barriers, enclosures, doors, mufflers and silencers; acoustic attenuators, screens, louvres, barriers, enclosures, doors, mufflers and silencers made primarily of metal; metal attenuators, screens, louvres, barriers, enclosures, doors, mufflers and silencers having sound insulating properties; and parts and fittings for the aforesaid goods

Sound control and acoustic installations, products and equipment, including acoustic louvres, acoustic ceiling panels, acoustic doors, silencers, wall panels, noise traps, sound enclosures, heavy machinery enclosures, acoustic alternators and acoustic partitions; sound control and acoustic materials