Electric floor polishing machines and apparatus; Machine parts, namely, polishing discs for floor polishing machines; Flap discs for power-operated grinders; Abrasive wheels for power-operated grinders; Polishing system for use in single-head machines comprising grinding and polishing discs for stone profiling and edges; Polishing machines for use in grinding and polishing metal, wood, ceramics and plastics; Power-operated polishers; Power driven polishers; Power-operated tools, namely, buffe...