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feb 29, 1972 - 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。

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工业大事年表

2 Sep 2023

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Date:

feb 29, 1972

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~ 53 years ago

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