| |||
| telegraphic concentrator | |||
| change-over switch | |||
| line concentrator; changer-over switch | |||
| collector | |||
| commutator | |||
|
commutator : 10 phrases in 5 subjects |
| Automated equipment | 1 |
| Electronics | 3 |
| Information technology | 1 |
| Measuring instruments | 1 |
| Mechanic engineering | 4 |