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Date: 2006-05-31 16:54:52Time Physics National Institute of Standards and Technology Verge escapement Atomic clock John L. Hall NIST-F1 JILA Pendulum clock Measurement Horology Clocks | Defining and Measuring Optical FrequenciesAdd to Reading ListSource URL: www.nobelprize.orgDownload Document from Source WebsiteFile Size: 2,09 MBShare Document on Facebook |