7 Machines and their parts for the chemical industry and for the cement, coal, mineral 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, heat exchangers as parts of machines, mine borers, mud catchers and collector machines being part of mine borers, milling machines for the treatment of ore, pneumatic transporters, pneumatic tube conveyors, regulators as parts of machines, rolling mills, power operated separating machines, shredder machines for industrial use, sieves a 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; comminution machines and their parts, in particular cone crushers and roller crushers for the cement, coal, mineral and metal industry; mills in the nature of roller mills, hammer mills, ball mills, roller plate mills and vertical mills for the cement, coal, mineral and metal industry and their parts; presses, in particular roller presses and briquetting machines; machine parts, namely, mill stones and annular casings with and without hard bodies for milling or pressing rollers; separating machines and their parts for separating fine bulk goods, in particular wind, cascade and rod basket sifters; sorting machines and their parts, in particular wet sorting machines, jigging machines, flotation machines and magnetic graders