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| ringing oscillator; voice-frequency ringer | |||
| voice-frequency ringing set | |||
| ringing tone supply | |||
| v.f. ringer (voice-frequency ringer; без конкретизации частоты); 2100-Hz ringer (c точным указанием частоты); voice-frequency ringer (v.f. ringer; без конкретизации частоты) | |||
| 俄语 词库 | |||
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| ГТВ | |||