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U.S. Department of Commerce

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nist_physicists_steve_jefferts_and_tom_heavner_with_the_nist-f2_cesium_fountain_atomic_clock_a_new_civilian_time_standard_for_the_united_states.jpg

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.

National Institute of Standards and Technology

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1401 Constitution Ave NW
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