 |
| |||
| double tone multiple frequency; dual-tone multi-frequency | |||
|
multifrequence bitonale : 2 Phrasen in 1 Thematik |
| Informationstechnik | 2 |
|
| |||
| double tone multiple frequency; dual-tone multi-frequency | |||
|
multifrequence bitonale : 2 Phrasen in 1 Thematik |
| Informationstechnik | 2 |