37 Maintenance and repair of vacuum cleaners, industrial vacuum cleaners, commercial vacuum cleaners, cyclonic vacuum cleaners, steam vacuum cleaners, vapour vacuum cleaners, industrial steam cleaners, floor cleaning machines, electric sweepers, dust collecting machines, dust removing installations for cleaning purposes; hire of vacuum cleaners, industrial vacuum cleaners, commercial vacuum cleaners, cyclonic vacuum cleaners, steam vacuum cleaners, vapour vacuum cleaners, industrial steam cleaners, floor cleaning machines, electric sweepers, dust collecting machines, dust removing installations for cleaning purposes.