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NIST physicists Steve
Jefferts (foreground) and Tom Heavner with the NIST-F2 cesium fountain atomic clock, a new civilian time standard for the United States.
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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National
Institute of Standards and Technology - Physics Laboratory: Time and Frequency Division
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http://patapsco.nist.gov/imagegallery/details.cfm?imageid=1319
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