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apr 19, 1964 - 1964年4月19日上海科化医用仪表厂试制成功6种不同型号的X光电子管，填补中国大型X光电子管空白。

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1964年4月19日上海科化医用仪表厂试制成功6种不同型号的X光电子管，填补中国大型X光电子管空白。

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工业大事年表

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apr 19, 1964

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~ 61 years ago

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