inverters; lighting arresters; lighting conductors; anti- interference devices [electricity]; wire connectors; voltages surge protectors; manual switching apparatus for telecommunication; telephone transmitters; telephone receivers; speaking tubes; manual telegraph apparatus; teletypewriters; automatic telegraph apparatus; transit switches; open-wire transmission machines and apparatus; carrier repeater machines and apparatus; voice frequency transmission machines and apparatus; power- line transmission machines and apparatus; cable transmission machines and apparatus; radio transmitters; transmitters for telecommunication; radio transmitters; radio receivers; audio and video receivers; fixed multi- channel communication apparatus; fixed single channel communication apparatus; communications apparatus for ships; satellite navigation equipment; communications apparatus for vehicles; communications apparatus for aircraft; portable communications apparatus; detectors; high-frequency apparatus; masts for wireless aerials; antennas; electric coils; holders for electric coils; converters; frequency converters; amplifiers; choking coils [impedance]; recorded computer software; recorded computer operating programs; recorded computer programs; and downloadable computer programs and software