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9 dez 1949 ano - National Bureau of Standards (now the National Institute of Standards and Technology, or NIST) builds the first atomic clock, using ammonia.
Adicionado na linha do tempo:
History of Time
By
Hayah
21 nov 2019
0
0
246
Data:
9 dez 1949 ano
Agora
~ 74 years ago
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