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| |||
| telephone repeater | |||
| telephonic repeater | |||
| interphone amplifier (встроенный); relay amplifier; telephone repeater set | |||
| телефонный усилитель: 9 phrases in 6 subjects |
| Communications | 1 |
| Electronics | 1 |
| Makarov | 3 |
| Rail transport | 1 |
| Technology | 2 |
| Telecommunications | 1 |