Tham khảo Điện_tín

  1. ↑ United States. Congress. House. Committee on Interstate and Foreign Commerce (1979). Hearings, Reports and Prints of the House Committee on Interstate and Foreign Commerce. U.S. Government Printing Office. tr. 715–. 
  2. ↑ “Fifty years of telex”. Telecommunication Journal (International Telecommunication Union) 51: 35. 1984. Truy cập ngày 18 tháng 5 năm 2017. Just over fifty years ago, in October 1933, the Deutsche Reichspost as it was then known, opened the world's first public teleprinter network. 
  3. ↑ Roemisch, Rudolf (1978). “Siemens EDS System in Service in Europe and Overseas”. Siemens Review (Siemens-Schuckertwerke AG) 45 (4): 176. Truy cập ngày 4 tháng 2 năm 2016. The inauguration of the first telex service in the world in Germany in 1933 was soon followed by the development of similar networks in several more European countries. However, telex did not enjoy significant and worldwide growth until after 1945. Thanks to the great advantages of the new telex service, above all in overcoming time differences and language problems, telex networks were introduced in quick succession in all parts of the world. 
  4. ↑ “RTTY Software”. The DXZone. 

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