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by Answerbag Staff on February 3rd, 2010

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What year were atomic clocks invented?

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  • by Thomas K. Arnold on February 3rd, 2010

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    The first prototype of an atomic clock, which uses atomic resonance frequency to keep time, was demonstrated in August 1948 at the National Bureau of Standards, which is now known as the National Institute of Standards and Technology. The clock was formally unveiled to the public in January 1949.

    Source:

    NST Primary Frequency Standards and the Realization of the SI Second (PDF)

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