37 Shipbuilding services; ship repair, conversion, and refit services, namely, maintenance and repair of ships; ship-husbandry services, namely, maintenance and repair of ships being painting and repairs of ships; maintenance and repair construction services relating to steel plate fabrication used in ships and ship building, namely, maintenance and repair of ships; ship-husbandry services, namely, maintenance and repair of ships being pipe, valve, and electrical repair services for ships; providing rigging and crane services for shipbuilding and ship repair purposes, namely, maintenance and repair of ships; boiler cleaning and repair services for ships