all relay automatic telephone system
全继电器制自动电话交换机
全继电器制自动电话系统
全体呼叫
Automatic Switching System
automatic telephone system
automatic-switching-system
fully automatic switching system
longitudinal-transverse system automatic telephone exchange
private automatic switching system
step-by-step automatic telephone system
telegraph automatic switching system
local (urban) telephone switching system
Stored program-control telephone switching system
Telephone switching system
10kV standby power supply automatic switching device
air traffic control automatic system
all-optical automatic switching network
automatic coin telephone system
automatic data editing and switching system
automatic data switching system
automatic dialling mobile telephone system