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sep 30, 1985 - 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。

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工业大事年表

2 Sep 2023

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688

Date:

sep 30, 1985

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~ 40 years ago

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