Field telephones and telegraphs for army use : including an elementary course in electricity and magnetism / by E.J. Stevens voor de veldtelefoon. (The Soundpowered-telephone) Signal training. Vol. III : Telephone sets F., marks I and I* Telephone switchboard operator : instructors guide for all arms / prepared under the direction of the chief signal officer Radar / American Telephone and Telegraph Co. IT&T : electronics and telecommunication use of field telephones in the field / A.G. Grinling speaking telephone, talking phonograph and other novelties / G.B. Prescott Installation of the first direct telecommunications link between the Netherlands and Denmark by means of repeatered submarine coaxial cable 1951 / Standard Telephones and Cables … Telephon und dessen praktische Verwendung / J. Maier u. W.H. Preece Telephon, Mikrophon und Radiophon, und ihre Anwendung in der Praxis / F. Shwartze elektrischen Telegraphen, das Telephon und Mikrophon / F. Binder
