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apr 3, 1989 - 1989年4月3日国家重点建设项目——中国与比利时合营的数字电话交换系统工程在上海通过国家验收。

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1989年4月3日国家重点建设项目——中国与比利时合营的数字电话交换系统工程在上海通过国家验收。

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工业大事年表

2 Sep 2023

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Date:

apr 3, 1989

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~ 36 years ago

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