Connection elements for communication and data networks, namely terminal strips, disconnection strips and switch strips, junction boxes, cable guide devices and cable pullout devices, junction cables and flexible cords, light wave guides, plugs, connector pairs, connector pairs for printed wiring boards, couplings for lightwave guides, protective magazines and elements thereof, screen inter-active devices, cover strips, connection parts, connection racks, sectional bar racks and casings for the aforementioned connection elements; insertion devices for casings; optical and electronic components and devices (if included in class 9), modems and data processing programs (if included in class 9) for communication and data networks