 |
| |||
| main exchange; parent exchange | |||
| central switching office; central exchange; central office; district exchange; primary exchange | |||
|
central principal : 13 phrases, 5 sujets |
| Général | 4 |
| Génie mécanique | 2 |
| Politique | 1 |
| Technologie | 4 |
| Télécommunications | 2 |