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| central exchange (Telefonvermittlung); central office (Telefonvermittlung); main exchange (Telefonvermittlung); telephone central office (Telefonvermittlung) | |||
| sub-zone center; sub-zone centre; regional exchange; secondary centre (DDD) | |||
| central office (Vermittlungsstelle im Fernsprechverkehr) | |||
| central switching office; central exchange; central office; district exchange; main exchange; primary exchange | |||
| Hauptamt: 2 phrases in 2 subjects |
| Earth sciences | 1 |
| General | 1 |