Audio-receivers and video-receivers; Audio dubbing apparatus; Closed circuit TV systems for security and surveillance, namely, cameras, switchers, monitors, microphones, and recorders; Computer network adapters, switches, routers and hubs; Computer network hubs, switches and routers; Computer network switches; Computer switches; Data cables; Digital telephone switching apparatus; Fiber optic connectors; Junction boxes; Optical fibres, telephone receivers, switchboards, telephone and telegraph...