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Date: 2003-04-23 14:11:48National 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 | Time & Freq Sp Publication AAdd to Reading ListSource URL: www.tf.nist.govDownload Document from Source WebsiteFile Size: 2,90 MBShare Document on Facebook |