Report copyright - 新しい時間をつくる - JSTSr Tokyo(Sr,Yb,Hg) JILA(Sr) SYRTE(Sr,Hg) NIST(171 Yb) SI limited measurement done 2009 NICT(Sr) NPL(Sr) PTB(Sr) KRISS(Yb) AIST(Yb) LENS(Sr) HHU(Yb)
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