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The production and calibration of Foucault test objects of various contrasts [0.03%]
各种对比度福科测试物镜的制作与校准
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H S COLEMAN
H S COLEMAN,S W HARDING
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A hollow cathode source applicable to spectrographic analysis for the halogens and gases [0.03%]
一种适用于卤素和气体光谱分析的空心阴极源
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