6 Building elements of metal for vehicle thoroughfares, namely, steel masts, poles of metal for power lines, metal pipes, metal castings, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of copper or its alloys, copper wire, not insulated, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of aluminum or its alloys, stainless steel pipes, metal railway crossovers, cable stretchers and cincture stretchers of metal, cable thimbles of metal, hose clamps of metal, cantilevered brackets of metal, reinforcing materials of metal for building, steel wire rope; building elements of metal for railway tracks, namely, steel masts, poles of metal for power lines, metal pipes, metal castings, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of copper or its alloys, copper wire, not insulated, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of aluminum or its alloys, stainless steel pipes, metal railway crossovers, cable stretchers and cincture stretchers of metal, cable thimbles of metal, hose clamps of metal, cantilevered brackets of metal, reinforcing materials of metal for building, steel wire rope; building elements of metal for trolleybus thoroughfares, namely, steel masts, poles of metal for power lines, metal pipes, metal castings, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of copper or its alloys, copper wire, not insulated, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of aluminum or its alloys, stainless steel pipes, metal railway crossovers, cable stretchers and cincture stretchers of metal, cable thimbles of metal, hose clamps of metal, cantilevered brackets of metal, reinforcing materials of metal for building, steel wire rope; building elements of metal for overhead, ground or underground electricity supply equipment for thoroughfares, namely, steel masts, poles of metal for power lines, metal pipes, metal castings, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of copper or its alloys, copper wire, not insulated, castings, foils, powder, and rolled, drawn or extruded semi-finished articles of aluminum or its alloys, stainless steel pipes, metal railway crossovers, cable stretchers and cincture stretchers of metal, cable thimbles of metal, hose clamps of metal, cantilevered brackets of metal, reinforcing materials of metal for building, steel wire rope; non-luminous and non-mechanical signs of metal; non-luminous metal beacons, namely, pylons of metal for conductor lines and outdoor lighting