| |||
| Zusatzfernsprecher m; Zweitfernsprecher m | |||
| Nebenstelle f; Nebenstellenapparat m | |||
|
extension set : 12 phrases in 7 subjects |
| Cables and cable production | 1 |
| Electrical engineering | 2 |
| Electronics | 2 |
| Medical appliances | 1 |
| Microelectronics | 2 |
| Technology | 3 |
| Telecommunications | 1 |