Radar / American Telephone and Telegraph Co. use of field telephones in the field / A.G. Grinling speaking telephone, talking phonograph and other novelties / G.B. Prescott IT&T : electronics and telecommunication Field telephones and telegraphs for army use : including an elementary course in electricity and magnetism / by E.J. Stevens 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 Portable military L.B. set / [uitgave van] Bell telephone MFG. co. Antwerp handleiding Digitaal snelheidsmeten met de standaard telephone Doppler radar / [samenst.: W.B.G.M. Oude Vrielink] voor de veldtelefoon. (The Soundpowered-telephone)
