7 Machines and their parts for the chemical industry and for the coal, mining and metal industry, namely, aerators, belt conveyors, belts for conveyors, compressed air pumps, disintegrators, earth moving machines, engines or motors not for land vehicles, grinding machines, mine borers, mud catchers and collector machines being part of mine borers, milling machines for the treatment of ore, pneumatic transporters, pneumatic principal tube conveyors, regulators as parts of machines, rolling mills, power operated separating machines, shredder machines for industrial use, sieves as machines for industrial use, sieves as parts of machines for industrial use, sifters as machines for industrial use, sifting installations as machines for industrial use, air condensers in the nature of steam condensers, steamrollers, stone grinding machines, suction machines for industrial purposes, vibratory screen separators for industrial use; communution machines and their parts, in particular cone crushers, rotary crushers, jaw crushers, roller crushers, vibratory mills and disc-vibratory crushers for the coal, mining and metal industry; mills and their parts, in particular roller mills, hammer mills, ball mills, pan grinders, vertical mills and vibratory mills for the coal, mining and metal industry; presses and their parts, in particular roller presses and briquetting machines for the coal, mining and metal industry; mill stones and annular casings with and without hard bodies for mill or press rollers for the coal, mining and metal industry; plants and their parts for separating fine bulk material, in particular wind, cascade, and rotary drum sifters as well as wet sifters and dry classifiers for the coal, mining and metal industry; sorting machines and their parts, in particular wet sifters, jiggers, linear jiggers, flotation machines and magnet separators for the mining and metal industry; sieving machines, sieves as machine parts for the mining and metal industry; dewatering apparatuses, centrifuges, filters as parts of machines or engines, press filters, filtration machines, vacuum-filtration machines, inserts for filtration machines, conveying apparatuses for mines, conveying machines, belt conveyors, pneumatic conveyors, conveyor belts for the coal, mining and metal industry