本地电话线路
LTC Local Telephone Circuit
电话线路集线器
telephone line concentrator
电话线路扩容器
Telephone lines expanding devices
电话线路针式绝缘子
pin insulator for telephone line
横越大西洋电话线路
trans-Atlantic telephone circuits
横越太平洋电话线路
trans-Pacific telephone circuits
明线12路晶体管载波电话终端机
open-wire 12-channel carrier telephone terminal equipment
《陆海军联合无线电话电报规程》
Joint Army and Navy Radiotelegraph and Radiotelephone Procedure
帮流电话电路
booster telephone circuit