common battery switchboard 共电式交换机

local battery switchboard 磁石式电话交换机 ; 自带电池电话总机

central battery switchboard 共电式交换台 ; 共电式交换机

manual common battery switchboard 人工共电式交换台

common battery toll switchboard 共电制长途电话交换机

local battery telephone switchboard 磁石式电话交换机

central battery local switchboard 共电式市内交换机

common-battery telephone switchboard 共电电话交换机

common - battery telephone switchboard 共电电话交换机

common battery telephone switchboard [通信] 共电制电话交换机