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National Institute of Information and Communications Technology(NICT)
(2009-08-01)
Physikalisch-Technische Bundesanstalt (PTB)
(2009-08-01)
National Physical Laboratory(NPL)
(2009-08-01)
National Institute of Standards and Technology (NIST)
(2009-08-01)
United States Naval Observatory(USNO)
(2009-08-01)
Bureau International des Poids et Mesures(BIPM)
(2009-08-01)
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2009 National Time Service Center (NTSC), Chinese Academy of Sciences , All Rights Reserved
