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sep 27, 1968 - 1968年9月27日上海钟厂试制成功中国第一台音叉钟。

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1968年9月27日上海钟厂试制成功中国第一台音叉钟。

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工业大事年表

2 Sep 2023

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sep 27, 1968

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~ 57 years ago

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