1) Class: 37
Description: maintenance and repair, maintenance services, maintenance and repair of machinery, maintenance and repair services
2) Class: 40
Description: energy generation, production of energy, generation of energy, energy generation services, energy production services, production of energy by power plants, electricity generating, processing and transforming of energy, electricity generation, production of electrical energy from renewable sources, generating of electricity, generation of electricity, clean energy production, consultancy in the field of energy production, production and processing of fuels and of other sources of energy, energy production, production of electrical power from renewable sources, consultancy in the field of energy generation, production of electricity, generation of gas and electricity, generation of power, generation of electrical power, clean energy production from hydrogen, production of renewable green energy, production of electrical power, generation of electricity from solar energy, generation of electricity using solar energy, generation of solar electricity
3) Class: 42
Description: engineering design, engineering studies, engineering research, design of engineering products, consultancy in the field of engineering, engineering consultancy, mechanical engineering, electrical engineering, engineering design services, research, development, analysis and consultancy services in the field of engineering, engineering services in the field of energy technology, engineering services relating to energy supply systems, chemical engineering, environmental engineering services, engineering services for the gas industry, engineering consultancy services, plant engineering, development and testing services in the field of engineering, technical project planning in the field of engineering, engineering project management services in the field of oil industry, electrical engineering services, engineering project management services, mechanical engineering services, engineering feasibility studies, computer aided engineering design, mechanical and electrical engineering services, engineering services in the field of food processing facilities, engineering project management services in the field of refinery industry, engineering project management services in the field of mining industry, technical studies, plant engineering services, engineering, engineering services, engineering services in the field of reducing operational costs of industrial machinery