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9 déc. 1949 - National Bureau of Standards (now the National Institute of Standards and Technology, or NIST) builds the first atomic clock, using ammonia.
Ajouté au bande de temps:
History of Time
By
Hayah
21 nov. 2019
0
0
246
Date:
9 déc. 1949
Maintenaint
~ Il y a 74 ans
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