Construction materials, namely, ceiling [ and partition wall ] systems of metal for the construction sector and components of metal therefor, consisting predominantly of suspension devices in the nature of metal cable wire or steel wire rope, support strips in the nature of all-purpose metal straps, metal support straps or ceiling supports of metal, metal clamps in the nature of clamping strips and profile strips for arranging devices on and in walls, ceilings and other surfaces, cross-connec...