Dust removing installations for cleaning purposes; Electric wax-polishing machines for household purposes; Electric wax-polishing machines for industrial purposes; Grinding and polishing machines; Leather polishing machines; Machine parts, namely, polishing discs for floor polishing machines; Machines for sanding floors; Polishing machines for use in grinding and polishing metal, wood, ceramics and plastics; Power-operated polishers; Sanding machines for woodworking