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jan 28, 1867 - 德国西门子发明自激发电机。瑞典诺贝尔发明雷管和炸药。

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1867年德国西门子发明自激发电机。瑞典诺贝尔发明雷管和炸药。

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jan 28, 1867

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~ 159 years ago

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