These and other things were done : The war story of standard telephones and cables limited / Douglas Reekie
Moe's Principle an econometric investigation intended as an aid in dimensioning and managing telephone plant : Theory and tables / Arne Jensen
Le télégraphe dans ses relations avec la jurisprudence civile et commerciale / Filippo Serafini
Guia prático do radiofilo / Álvaro Contreiras; pref. Comandante Nunes Ribeiro
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