Tf /v_tắt/KT_GHI (Tonfrequenz)/
[EN] AF (audio frequency)
[VI] AF
Tf /v_tắt/Đ_TỬ (Tonfrequenz)/
[EN] AF (audio frequency)
[VI] AF
Tf /v_tắt/TV (Tonfrequenz)/
[EN] AF (audio frequency)
[VI] AF
Tf /v_tắt/VT&RĐ (Tonfrequenz)/
[EN] AF (audio frequency)
[VI] AF