XIII international switching symposium 1990 : innovations in switching technology
O telefone audio-visual : experiencias na Suécia; revista das revistas estrangeiras / F. do Vale de Guimarães
Le téléphone a Stockholm 1930 / Anders Lignell
Code list containing the names of Swedish ships to which signal letters of the commercial code of signals have been allotted
Welcome to the first day of an exciting week / ISS'90 Organizing Committee; Northern Telecom, Canada