telephone ringer
... 电话电缆专用电桥 telephone bridge; 电话电铃 telephone ringer; 电话电流 telephone current; ...
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同线电话振铃电键 party line ringing key
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斜井提升应同时设立电铃和电话两套信号系统。
Bell signal systems and communication systems must be using at same time for decline hoisting system.
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