42 Electrical and mechanical engineering services, commercial, municipal and institutional engineering services; conducting power systems studies, testing of electrical and mechanical equipment and systems; commissioning of engineering-based services in the aluminum, chemical and petrochemical, mines and metallurgy, pulp and paper and electrical sectors, namely conducting an initial examination of a function/operation by means of testing and performing adjustments; computer project management services; process control technical consulting regarding optimization and loop control, simulation, sensor selection, optic technology, PLC programming, SCADA programming; mechanical engineering consulting regarding machine design, loud calculations, circuit analysis, dimensioning, mechanisms and structures, and hydraulic/pneumatic; computer technology consultation regarding networking, application programming, computer driver programming