Guide to the correction of errors in code (and other) telegrams / The Telegraph Convention
S. Gabriel Padroeiro das Telecomunicações / Filipe Furtado de Mendonça
Colección histórico-tecnológica de Telefónica / Rafael Romero Frias; Fundación Arte y Tecnologia (Telefónica)
New communication services: a chalange to computer technology : proceedings / Eight International Conference on Computer Communication ; ed. lit. P. J. Kuehn
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