| |||
| switching signal | |||
| through-connection signal | |||
|
signal de commutation : 10 phrases in 4 subjects |
| Automated equipment | 1 |
| Communications | 4 |
| Electronics | 4 |
| Telegraphy | 1 |
| |||
| switching signal | |||
| through-connection signal | |||
|
signal de commutation : 10 phrases in 4 subjects |
| Automated equipment | 1 |
| Communications | 4 |
| Electronics | 4 |
| Telegraphy | 1 |