File:Photographies of Koga's research group and the main building of Tokyo Institute of Technology .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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current01:16, 11 January 2016 (147 KB)R1CUTQUARTZ (talk | contribs)Invention of Temperature-Insensitive Quartz Oscillation Plate Enabling Highly Stable Communications and Clocks, 1933: Photographies of Koga'research group and the main building of Tokyo Institue of Technology.
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