Couplers (data processing equipment); Interfaces (for computers); Aerials; Transmitters of electronic signals; Branch boxes (electricity); Intercommunication apparatus; Masts for wireless aerials; Cables, electric; Wires, electric; Material for electricity mains (wires, cables); Copper wire, insulated; Coaxial cables; Fibre optic cables; Connectors (electricity); Switches, electric; Junction boxes (electricity); Electric plugs; Electric sockets; Connections for electric lines; Couplings, electric; Lightning arresters