片语
relay for telegraph电报用继电器
TARE Telegraph Automatic Relay Equipment电报自动中继设备
automatic telegraph relay equipment[通信]
telegraph switching relay system电报交换系统
automatic telegraph-relay自动转报
telegraph vibrating relay电报振动替续器
automatic telegraph relay center自动转报中心
telegraph automatic relay equipment电报自动中继设备
mechanization of telegraph relay电报中继的机械化