4 Gas, gaseous fuels and oil.
37 Installation, repair, emergency service maintenance of gas appliances, pipework apparatus and instruments using gas; laying, repair, maintenance, replacement and refurbishment of pipelines, repair of roads and paths; construction, repair and maintenance of gas installations; installation, repair and maintenance of energy-using appliances and instruments, construction, repair and maintenance of energy-using installations; installation of insulating materials, drilling of wells, exploitation and extraction of oil and gas, oil and gas drilling, oil pumping and extraction; underwater construction, demolition, building construction services, construction, maintenance and renovation of property.
38 Communication and telemetry services, telecommunication services.
39 Storage, distribution, transportation, shipping and delivery of gas, liquified natural gas, gaseous fuels and oil; transmission and/or distribution and/or supply of electricity and other energy sources; leasing and rental of cars and commercial vehicles; underwater diving services.
40 Generation of electricity, decommissioning of redundant gas and oil platforms and drilling rigs, waste disposal.
42 Auditing of energy consumption and of the efficiency of operation of appliances and the safety checking of appliances and pipework, scientific, engineering environmental research and development services, geophysical and geological surveys services, obtaining hydrocarbons such as natural gas and crude petroleum from below ground such as oil fields; underwater exploration; land development; surveying, computer services, maintenance and updating of computer software; design of computer software and programming; waste disposal; testing of gas appliances pipework, apparatus and instruments utilising gas, inspection of pipelines, measuring gas consumption.