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12-Channel Carrier A. G. Clavier aerial Airport antenna apparatus application Automatic Radio Compass British Broadcasting Station Buenos Aires carrier power carrier systems cathode mercury vapor channels Coaxial Cables commercial connection dialing Electrical Communication Electrical Engineers Europe exchange facilities Frank Gill High Power Broadcasting hot cathode hot cathode mercury included installed Institute of Electrical International Eucharistic Congress International Telephone lines Liverpool Cathedral loaded London long distance telephony manufacture Marine Radio mercury vapor rectifiers metres Micro-Ray modulation operation Paris Pioneers of Electrical Public Address System quads Queen Mary quency radio links radiotelephone radiotelephone circuits Rollo Appleyard Rotary Automatic Telephone Rotary System short wave signal single sideband Spanish Morocco styrene Switching Tele telephone Telephone and Telegraph Telephone Cable Telephones and Cables Teleprinter television tests tion toll cable traffic trans transatlantic transmission tube ultra-high frequency Voice Frequency voltage wavelengths wire zones Zurich