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3 apr 1989 anni - 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。

Descrizione:

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。

Aggiunto al nastro di tempo:

工业大事年表

2 set 2023

1

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688

Data:

3 apr 1989 anni

Adesso

~ 36 years ago

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