7 TOOLS, APPARATUS, MACHINERY AND EQUIPMENT FOR INSPECTING, REPAIRING, CLEANING, SCRAPING, DRILLING, TAPPING, PLUGGING AND BYPASSING PIPELINES AND OTHER FLOW CONDUITS
37 CONSTRUCTION, MAINTENANCE AND REPAIR SERVICES FOR PIPELINES, GAS DISTRIBUTION SYSTEMS AND FOR INDUSTRIAL, REFINERY, CHEMICAL AND PROCESS PLANT PIPING SYSTEMS
42 ENGINEERING, INSPECTING AND SURVEYING SERVICES FOR PIPELINES, GAS DISTRIBUTION SYSTEMS AND INDUSTRIAL, REFINERY, CHEMICAL AND PROCESS PLANT PIPING