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Communications
containing
音 调
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调车信号音
shunting signal tone
调车呼叫信号音
shunting calling tone
音选调度电话分机
dispatching telephone extension with Voice Frequency
VF
selective calling
音选调度电话总机
dispatching telephone control board with Voice Frequency
VF
selective calling
音频选叫调度电话滤波器
bridging filter for dispatching telephone with AF selective calling
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