37
Construction of structures for the production of crude oil; Construction of structures for the transportation crude oil; Construction of oil and gas storage installations; Maintenance and repair of oil and gas storage installations; Construction of structures for the transportation of natural gas; Installation and maintenance of photovoltaic installations; Installation of power generating apparatus; Maintenance of power generating apparatus and installations
42
Engineering services; Engineering services in the field of energy technology; Engineering services in the field of electrical power and natural gas production; Design and development of regenerative energy generation systems; Drafting and development of photovoltaic systems; Provision of technical consultancy to the petrochemical industry; Analysis and testing for oil workings; Analysis and testing services for the oil industry; Provision of technical consultancy to the oil refining industry; Conducting feasibility studies relative to oil field exploitation; Analysis and testing services in the field of oil exploitation; Engineering services for the gas industry; Conducting feasibility studies relative to gas exploitation; Engineering services relating to gas transport and supply systems; Research and development services; Research and development services in the field of engineering