Grinders being power tools; Grinding and polishing machines; Grinding machines for metalworking; Grinding machines for the treatment of ceramics and metal; Grinding machines with spiral bevel gears; Grinding mills for chemical processing; Grinding tools for grinding machines; Abrasive wheels for power-operated grinders; Centrifugal grinding machines; Components for machines and machine tools, grinding machines, material handling machines, food processing machines, chemistry processing machines and textile industry machines, namely, sand, chemical and reverse osmosis filters; Feed grinding machines; Flap discs for power-operated grinders; Hydraulic pumps and motors for hydrostatic systems, comprised of pumps, motors, valves, switches, sensors and electronic controls, for hydraulic drives and force transmission in machines, machine tools, grinding and food processing machines and in off-road-vehicles; Internal grinding machines; Involute grinding machines; Knife grinding machines; Milling grinding motors; Milling machines and grinding machines for the treatment of ceramics and metal; Polishing machines for use in grinding and polishing metal, wood, ceramics and plastics; Polishing system for use in single-head machines comprising grinding and polishing discs for stone profiling and edges; Power-operated grinding wheels; Power-operated grinding wheels for optical lens grinding; Power-operated angle grinders; Rotary grinding machines; Screw grinding machines; Tool grinding machines; Vibratory grinding machines; Wheel adapters for power-operated grinders; Wire wheels for power-operated grinders; Wood grinding machines