37 Installation of electrical apparatus, electrical equipment, electrical installations, electrical systems, namely, electric current switches, electric switches, power switches, electric contactors, electric relays, circuit breakers, electric panel boards; installation of automation control apparatus, namely, programmable controllers, digital controllers, robot controllers, electric and electronic sensors for temperature and electric current, signaling lights, electric relays; bringing into service, namely, installation of electrical apparatus, electrical equipment, electrical installations, electrical systems, namely, electric current switches, electric switches, power switches, electric contactors, electric relays, circuit breakers, electric panel boards; bringing into service, namely, installation of automatic control apparatus, namely, programmable controllers, digital controllers, robot controllers, electric and electronic sensors for temperature and electric current, signaling lights, electric relays; maintenance of electrical equipment, electrical installations, electrical systems, namely, electric current switches, electric switches, power switches, electric contactors, electric relays, circuit breakers, electric panel boards; maintenance of automation control apparatus, namely, programmable controllers, digital controllers, robot controllers, electric and electronic sensors for temperature and electric current, signaling lights, electric relays; servicing, namely, corrective maintenance and repair of electrical equipment, electrical installations, electrical systems, namely, electric current switches, electric switches, power switches, electric contactors, electric relays, circuit breakers, electric panel boards; servicing, namely, corrective maintenance and repair of automation control apparatus, namely, programmable controllers, digital controllers, robot controllers, electric and electronic sensors for temperature and electronic current, signaling lights, electric relays