Network communication equipment; intercommunication apparatus; antennas; cables, electric; instrument transformer; battery starter cables; voltage stabilizing power supply; distribution boxes (electricity); coils, electric; switches, electric; bus ducts; transformers (electricity); circuit breakers; current rectifiers; height voltage switchboards; quartz crystal (oscillators); polysilicon wafers; wafers for integrated circuits; epitaxial wafers of silicon; voltage regulators; regulating appar...