37 Providing servicing, maintenance and repair of power operated maintenance machines and equipment and structural parts and attachments therefor, namely, street sweepers and sidewalk litter sweepers, rider and walk-behind floor scrubbing machines, rider and walk-behind floor sweeping machines, wet and dry vacuum cleaners, carpet extractors, blowers, namely, power operated blowers, power-operated floor burnishers, floor buffers, portable carpet and upholstery spot cleaning machines, and all surface cleaning machines, namely, power-operated floor and wall cleaning machines for scrubbing, sweeping, polishing, vacuuming, blowing, burnishing, and buffing surfaces including floors, carpets, and bathrooms for industrial and commercial use