table block telephone 桌式闭塞电话机
tablet block telephone 通票阻塞电话机
Chinese radio telephone office block 中国移动办公大楼
telegraph or telephone block system 通信闭塞制
pilot and telephone block system 响导及电路行车制
Telephone Block Wiring System 电话配线系统
Multicomponent telephone block access system 发明名称
telephone block working 电话闭塞法
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