asphalting, and shipbuilding; boiler and marine craft repair services; repair services in the field of asphalting; installation, maintenance and repair of computer hardware, electrical wiring, earthworks, mechanical equipment and concrete; plumbing services; construction and repair of apparatus for environmental clean-up and decontamination
Building Construction and Repairmaterial treatment services, namely, the mechanical or chemical processing or transformation of materials by inorganic or organic substances; metal casting services; boilermaking
Treatment of Materialshuman factor engineering requiring a high degree of mental activity and relating to theoretical or practical aspects of human effort; construction engineering services
Computer and Scientific