Telephony a detailed exposition of the telephone exchange systems of the British post office
| Autor principal: | |
|---|---|
| Format: | Llibre |
| Idioma: | English |
| Publicat: |
London
Pitman
1948, 1958.
|
| Autor principal: | |
|---|---|
| Format: | Llibre |
| Idioma: | English |
| Publicat: |
London
Pitman
1948, 1958.
|