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Date: 2010-08-19 16:35:00National Institute of Standards and Technology Time Time in the United States SI base units Atomic clock WWV NIST-F1 Metre International Atomic Time Measurement Clocks Horology | NIST Time and Frequency ServicesAdd to Reading ListSource URL: nist.govDownload Document from Source WebsiteFile Size: 1,80 MBShare Document on Facebook |