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may 21, 1990 - 1990年5月21日上海特种灯泡二厂和上海轻工研究所联合研制成功双U形节能灯弯管机填补国内空白。

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1990年5月21日上海特种灯泡二厂和上海轻工研究所联合研制成功双U形节能灯弯管机填补国内空白。

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工业大事年表

2 Sep 2023

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Date:

may 21, 1990

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~ 35 years ago

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