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Date: 2007-11-08 20:34:42Physics Horology National Institute of Standards and Technology Time scales SI base units Atomic clock NIST-F1 NIST-7 Symmetricom Measurement Clocks Time | December[removed]measure NCSL INTERNATIONAL The Journal of Measurement ScienceAdd to Reading ListSource URL: www.tf.nist.govDownload Document from Source WebsiteFile Size: 2,03 MBShare Document on Facebook |