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30 set 1985 ano - 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。

Adicionado na linha do tempo:

工业大事年表

2 set 2023

1

0

686

Data:

30 set 1985 ano

Agora

~ 40 years ago

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