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Terms for subject General containing Local Exchange | all forms
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local battery telephone exchange磁石式电话交换机
local battery with buzzer calling telephone exchange用蜂鸣器呼叫的磁石式电话交换机
local battery with magneto and buzzer calling telephone exchange用手摇发电机和蜂鸣器呼叫的磁石式电话交换机

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