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技术 革 新JH74—32B型会议电话汇接台制作简介晶体管十路人工电报汇接器305型明线十二路载波增音机305型明线十二路载波增音机(续)EB—lOA型共桥式自动汇接机简易晶体管线路障碍测试器载波通信用于对称电缆的SPS 300路系统C120型120路单管同轴电缆系统新型单管同轴地区通信电
Technical Innovation JH74-32B Conference Calls Transposer Production Introduction Transistor 10-way manual telegraphy connector 305-type bright line 12-way carrier amplifier 305-type bright line 12-way carrier amplifier (continued) EB-lOA-type common bridge Automated Tamper Simple Transistor Line Barrier Tester Carrier Communication SPS 300-System for Symmetric Cables C120 120-Cell Single-Coaxial Coaxial Cable System New Single-Coaxial Area Telecommunications