[DOC] [TLE] A Brief History of Atomic Clocks at NIST - Time and Frequency Division [PAR] 1949 -- Using Rabi's technique, NIST (then the National Bureau of Standards) 
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Time and Frequency at the Bureau International des Poids et Mesures (BIPM) 
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Bureau of Standards built an ammonia clock that was completed in 1949 and is ... 
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Question: Using an ammonia molecule, in 1949 the first atomic clock came from what was then called the U.S. Bureau of these
Answer: Standards