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1970年9月上海开关厂试制成功完全不用油的 3.5万伏化学气体高压开关，填补中国电器工业空白。 (sep 1, 1970 – jan 1, 0)

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1970年9月上海开关厂试制成功完全不用油的 3.5万伏化学气体高压开关，填补中国电器工业空白。

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ByLoo Qoo
2 Sep 2023
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Date:

sep 1, 1970
jan 1, 0
~ 0 days
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