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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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9 dic 1949 año - National Bureau of Standards (now the National Institute of Standards and Technology, or NIST) builds the first atomic clock, using ammonia.
Añadido al timeline:
History of Time
By
Hayah
21 nov 2019
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fecha:
9 dic 1949 año
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~ 75 years ago
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