您要查找的是不是：
- AM voice frequency carrier telegraph system 调幅音频载波电报系统
- VFT? Voice Frequency carrier telegraph Terminal? 音频载波电报终端?
- carrier telegraph system 载波电报方式
- Public use of Morse's telegraph system Began in 1844 and lasted more than 100 years. 1844年公众开始使用摩斯的电报系统,并一直持续了一百多年。
- A wire or system of wires connecting telephone or telegraph systems. 电话线连接电话或电报系统的电线或电线系统
- Telegraph systems became unusable across Europe and North America. 欧洲与北美各地的电报系统再次瘫痪。
- voice carrier telegraph testing equipment 音频载波电报测试仪
- VFT Voice Frequency carrier telegraph Terminal 音频载波电报终端
- frequency modulation carrier telegraph 调频式载波电报
- High Frequency Carrier Telegraph Channel 高频载波电报信道
- Morse Code is a telegraphing system invented in the 1840s, by Samuel F.B.Morse. 莫尔斯电码是一种电码系统发明于19世纪40年代，由塞缪尔全莫尔斯。
- voice frequency carrier telegraph multip 音频载波电报多路复用
- phase modulation carrier telegraph 调相式载波电报
- voice-frequency carrier telegraph 话频载波电报
- voice frequency carrier telegraph terminal 音频载波电报终端
- voice frequency carrier telegraph 音频载波电报
- error-correcting telegraph system 纠错电报系统,改错电报系统
- Variable Frequency Carrier Telegraph 变频载波电报
- permanent record telegraph system 永久性记录电报制
- audio frequency carrier telegraph measuring set 声频载波电报测试仪
