 |
| |||
| ringing current | |||
| signaling current | |||
| corriente de llamada: 8 phrases in 6 subjects |
| Communications | 1 |
| Information technology | 1 |
| Life sciences | 1 |
| Measuring instruments | 1 |
| Mechanic engineering | 1 |
| Telephony | 3 |
|
| |||
| ringing current | |||
| signaling current | |||
| corriente de llamada: 8 phrases in 6 subjects |
| Communications | 1 |
| Information technology | 1 |
| Life sciences | 1 |
| Measuring instruments | 1 |
| Mechanic engineering | 1 |
| Telephony | 3 |