Air filters for gear drives; Air filters for mechanical purposes; Dust collecting machines for chemical processing; Dust exhausting installations for cleaning purposes; Dust filters and bags for vacuum cleaners; Dust removing installations for cleaning purposes; Dust separators; Vacuum cleaner bags; Vacuum cleaner hoses; Vacuum cleaners; Vacuum cleaners for household purposes; Vacuum cleaners for industrial purposes; Commercial and industrial vacuum cleaners; Hand-held vacuum cleaners