Aerating pumps for aquaria; Back pressure valves as parts of machines; Central vacuum cleaning installations; Centrifugal pumps; Dust exhausting installations for cleaning purposes; Dust removing installations for cleaning purposes; Electric machines and apparatus for cleaning rugs, carpets and floors; Electric window cleaning machines; Machine parts, namely, mechanical seals; Pumps as parts of machines, motors and engines; Pumps for counter-current swimming; Pumps for machines; Taps being pa...