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  • (cur | prev) 01:43, 11 January 2016R1CUTQUARTZ (talk | contribs). . (211 bytes) (+211). . (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.)