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Meter and kilogram "prototypes" on display simultaneously for the first time in Tsukuba, Ibaraki

Summary by NHK World
[NHK] An alloy known as the "prototype" that has become the international standard for the units of length and mass, the "meter" and the "kilogram," was discovered on the 12th in Tsukuba, Ibaraki Prefecture...

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Meter and kilogram "prototypes" on display simultaneously for the first time in Tsukuba, Ibaraki

[NHK] An alloy known as the "prototype" that has become the international standard for the units of length and mass, the "meter" and the "kilogram," was discovered on the 12th in Tsukuba, Ibaraki Prefecture...

·Tokyo, Japan
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NHK World broke the news in Tokyo, Japan on Monday, May 12, 2025.
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