7 Machines for the treatment, processing, and production of metals and plastics, namely, milling machines and grinding machines, and machines utilizing rotational motion for high energy surface finishing and material treatment, in particular, heavy, medium and light section rolling mills, cold and hot mills, strip and wide strip mills, plate and sheet mills, blooming, slabbing and billet mills, universal mills, planetary mills, multi-purpose cold mills, rod, bar and tube mills, continuous mills, reversing mills, pilgrim mills, detaching mills and mills for the rolling of steel, iron, aluminum and copper or for the rolling of alloys of the same, and structural replacements parts for the aforementioned rolling mills; rolling mills for wire, steel rod rolling mills, bloom rolling mills, rail rolling mills, and section rolling mills, drawing machines, wire ring presses, reeling machines; machines for manufacturing, processing and working seamless and welded pipes, namely, pipe expanding machines, large pipe manufacturing machines, hot and cold pipe rolling mills, presses, in particular, extrusion presses, impact extrusion, cold extrusion and back-flow extrusion presses, cable sheathing presses, straightening and bending presses, plate shaping presses, deep-drawing presses, multi-stage presses, hydraulic metal powder presses, and structural replacement parts therefore; forging machines, in particular, open-die forging machines, automatic forging hammers, forging presses, piercing presses and counter blow hammers, and structural replacement parts for the aforementioned forging machines; casting machines, in particular, continuous steel slab casting machines and machines for the continuous casting of metals, plastic extrusion and plastic molding machines and structural replacement parts for the aforementioned casting machines; power generation machines, namely, mobile electric power generators, steam operated power generators for rolling, pressing, forging and casting installations; hydraulic driving machines, namely, drives for vacuum pumps, driving devices for lifts; supporting chain conveyors and hoists, conveyors in the nature of roller tables and tilters, scale washers, and roller cleaning machines; conveyors for the conveying of rolled, pressed, forged and cast articles to and from rolling, pressing, forging and casting installations; welding machines, namely, laser welding machines, electric welding machines, gas welding machines, pipe welding machines, butt-welding machines, cutting machines, in particular, pipe blades, flame cutting machines; machines for filling and emptying blast furnaces; machines for tilting, pivoting, and moving converters and ladles