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30 sett 1985 anni - 1985年9月30日中国与比利时合营的1240程控数字电话交换系统正式投入装配。建成后有 30万门电话交换机，大大提高电话通讯能力。

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1985年9月30日中国与比利时合营的1240程控数字电话交换系统正式投入装配。建成后有 30万门电话交换机，大大提高电话通讯能力。

Aggiunto al nastro di tempo:

工业大事年表

2 set 2023

1

0

688

Data:

30 sett 1985 anni

Adesso

~ 40 years ago

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