track circuit
with | polarized relay
| track circuit | |
| transp. el. | sporstrømkreds; skinnestrømkreds |
| polarized relay | |
| el. | polariseret relæ |
| |||
| sporstrømkreds; skinnestrømkreds | |||
|
track circuit : 45 phrases in 4 subjects |
| Communications | 1 |
| Electronics | 4 |
| Information technology | 4 |
| Transport | 36 |