VOICE-FREQUENCY

тональная телеграфия voice-frequency patching bay ≈ стойка тональной коммутации voice-frequency ringing generato ≈ вызывной генератор звуковой частот - voice-frequency channel - voice-frequency dialing - voice-frequency dialling - voice-frequency generator - voice-frequency receiver - voice-frequency ringer - voice-frequency ringing - voice-frequency signal - voice-frequency telegraph - voice-frequency telephony