7
Drilling control equipment, pumps, pipes, casings all for use in oil and gas drilling; apparatus and machinery for use in the operation of oil and gas wells; drilling machines; drilling rigs; borehole and well drilling apparatus; borehole downhole tools; drilling bits; oil and gas well completion and production equipment; wellhead valves and valve assemblies; pressure regulation apparatus; filtering machines; filters; machines for exhaustion, transportation, generation and preparation of gases; oil and gas production control equipment; oil and gas field equipment; oil refining machines; oil and gas separators; oil centrifuges
37
Installation of oil and gas production apparatus, machinery and equipment; installation of oil and gas production control systems; construction of structures for the production and storage of crude oil and natural gas; consulting services related to the installation of oil and gas production apparatus, machinery, equipment and control systems; consulting services in the field of oil and gas well drilling; site assembly of oil and gas production machines, equipment and installations; installation and maintenance of computer hardware systems for monitoring the operation and performance of oil and gas production apparatus, machinery and equipment
40
Oil and gas production services; refining of oil and gas; processing of oil and gas; gas compression services; custom manufacture and assembly services for oil and gas production machines, equipment and installations; information services relating to all of the aforesaid services; consulting services in the field of oil and gas production, oil and gas processing, oil refining; consulting services related to the manufacturing of oil and gas production apparatus, machinery, equipment and control systems; advisory services relating to oil and gas production
41
Educational and training services in the field of oil and gas production, oil and gas production machinery and equipment
42
Research and development services all relating to oil and gas production; technical support services and technical advice in the field of oil and gas production, production control systems, refinery processes, production apparatus; providing technology information relating to the oil and gas industry; technological and engineering consultancy services; engineering and engineering design services in the field of oil and gas production; design of equipment, apparatus and control systems for use in the production of oil and gas; production inspection, assembly monitoring, assembly inspection, commissioning and performance testing of oil and gas production machines, equipment and installations; installation and maintenance of computer software systems for monitoring the operation and performance of oil and gas production apparatus, machinery and equipment; computer-aided engineering design and testing; engineering drawing services; design of computer software in the field of oil and gas production; design of electrical and electronic apparatus and instruments for use in oil and gas production; quality and process control services; technical project studies in the field of oil and gas production; oil-well testing; oil-field surveys; technical and chemical research