File:Photographies of Koga's research group and the main building of Tokyo Institute of Technology.pdf
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Photographies_of_Koga's_research_group_and_the_main_building_of_Tokyo_Institute_of_Technology.pdf (file size: 147 KB, MIME type: application/pdf)
Invention of Temperature-Insensitive Quartz Oscillation Plate Enabling Highly Stable Communications and Clocks, 1933: Photographies of Koga's research group and the main building of Tokyo Institue of Technology.
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