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29 feb 1972 anni - 1972年2月29日上海钟表元件厂制成优质合成毛表油，填补中国手表工业空白。

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1972年2月29日上海钟表元件厂制成优质合成毛表油，填补中国手表工业空白。

Aggiunto al nastro di tempo:

工业大事年表

2 set 2023

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686

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29 feb 1972 anni

Adesso

~ 53 years ago

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