| 1. | Telephony : a detailed exposition of the telephone exchange systems of the British Post Office / J. AtkinsonAutor: Atkinson, J. Data Publicação: 1948 |  | |
| 2. | Telephony : a detailed exposition of the telephone exchange systems of the British Post Office / J. AtkinsonAutor: Atkinson, J. Data Publicação: 1950 | | |
| 3. | Telephony : a detailed exposition of the telephone exchange systems of the British Post Office / J. AtkinsonAutor: Atkinson, J. Data Publicação: 1948 | | |