gyohwangi
exchange device
appareil d'échange ; dispositif d'échange ; équipement d'échange
이 교환기는 전화 통화를 연결하는 데 사용됩니다.
i gyohwan-gineun jeonhwa tonghwareul yeongyeolhaneun de sayongdoemnida.
This exchange device is used to connect phone calls.
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