Indian sappers laying telephone cables in trench Veldtelefoon TELEPHONE SET "L" Indian Sappers removing electric fittings from Turkish telephone lines - With the troops in Mesopotamia Radar / American Telephone and Telegraph Co. Installation of the first direct telecommunications link between the Netherlands and Denmark by means of repeatered submarine coaxial cable 1951 / Standard Telephones and Cables … field manual Telephone switchboard operating procedure field manual Telephone switchboard operating procedure Naamlijst van de telefoontoestellen d5 en d5a (telephone sets d mk v; mk v*) - Koninklijke Landmacht Voorschrift no. 6064 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 Carrier terminal OA-13/FC, carrier repeater OA-10/FC, and carrier filter F-36/FC (type H carrier telephone packaged equipment) - USA Voorschrift, Technical Manual, 11-2025
