Category:NBS-4 atomic clock
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Atomic Caesium Clock NBS-4 from 1968. http://tf.nist.gov/cesium/atomichistory.htm
Media in category "NBS-4 atomic clock"
The following 2 files are in this category, out of 2 total.
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Atomic Clock048.jpg 6,057 × 4,686; 20.33 MB
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Nbs-4.jpg 425 × 203; 26 KB
