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9 Dez 1949 Jahr - National Bureau of Standards (now the National Institute of Standards and Technology, or NIST) builds the first atomic clock, using ammonia.
Zugefügt zum Band der Zeit:
History of Time
By
Hayah
21 Nov 2019
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0
245
Datum:
9 Dez 1949 Jahr
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~ 74 years ago
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