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oct 1, 1987 - 1987年10月1日上海供用电研究所高压等电位自验式声光验电器获得上海电业系统第一个国家专利权。

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1987年10月1日上海供用电研究所高压等电位自验式声光验电器获得上海电业系统第一个国家专利权。

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工业大事年表

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oct 1, 1987

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~ 38 years ago

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