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 Signal training. Vol. III : Telephone sets F., marks I and I* Telephone switchbord, type BD-14 Hazeltine Electronics Corporation. Preliminary instruction book for navy model TCS-6 radio telephone and telegraph transmitting and recieving equipment IT & T International Telephone and Telegraph. Worldwide manufacturing and telecommunications technical manual Telephone repeater TP-14 - USA voorschrift Technical Manual 11-2007 ATM. Strowger, Ten-line private automatic telephone exchange equipment ATM. Strowger 25-line private automatic telephone exchange equipment electrical and mechanical engineering regulations Repeater, telephone, 2-circuit : General description
