在通信产业中开辟新局面二三九厂张家三院２３９厂自引进原西德ＳＩＭＥＮＳＨＩＣＯＭ用户交换机技术及生产线后，经过十年的努力，在我国通信行业中占有了一席之地。但随着全国各地通信事业的飞速发展，特别是进入９０年代以来，通信事业发展之快超出人们预料。公众网的... Open up a new situation in the communications industry After the introduction of the original West German SIMENSHICOM subscriber line technology and production line, the 239th factory of the 239th Zhangjiasan Courtyard has occupied a place in the communications industry in China. However, with the rapid development of communications throughout the country, especially since the beginning of the 1990s, the development of communications has exceeded people’s expectation. Public network...