Apparatus for transmitting radio signals by cable; audio cable; audio cable connectors; cable converters for television being telecommunications apparatus; cable for electrical transmission; cables for electronic transmission; cables for optical signal transmission; cables for signal transmission systems; cabling networks (installations) incorporating fibre optic cables; coaxial cables for use in cable television installations; data transmission cables; fibre optic cable; wireless transmission apparatus; apparatus for electrical signal transmission; apparatus for sound transmission; apparatus for television transmission; apparatus for the transmission of data; apparatus for the transmission of sound or images