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

private line toll switchboard [通信] 长途专线台

manual toll switchboard 长途人工接续台

central battery toll switchboard 共电式长途交换机

cordless toll switchboard 无绳式长途交换台 ; 无绳式长途电话交换机

toll switchboard for semi-automatic operation 长途半自动接续台

toll private line switchboard 长途专线台

toll incoming switchboard 长途来话交换机