37 Civil construction services, namely, road and railroad construction; Asphalting; Carpentry services; Building construction; Construction services, namely, construction of railway tracks, underground railway tracks, tunnels, bridges, railway stations, underground railway stations, airports, and port facilities; Demolition of buildings; Pipe laying services; Masonry services; Excavation services; Installation of electrical systems; Fire and burglar alarm, lock and safe installation, maintenance and repair; Clock and watch repair; Installing, maintaining and repairing computer hardware; installation, maintenance and repair of heating equipment, ventilation equipment and air conditioners; Tyre maintenance and repair; Building maintenance and repair; Installation, maintenance and repair of window panes, windows and blinds; Plumbing installation, maintenance and repair; Lift and elevator installation, maintenance and repair; Installation and maintenance of furniture; Textile cleaning; Carpet and rug cleaning; Vehicle cleaning, namely, cleaning vehicle seats; Clothing repair; Disinfecting