File:NBS radio building where clock was built.jpg
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Photograph (probably taken in the 1920s) of the National Bureau of Standards Radio Building where the first atomic clock was developed.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:42, 3 March 2016 | | 4,210 × 5,391 (2.39 MB) | Mlombardi (talk | contribs) | Photograph (probably taken in the 1920s) of the National Bureau of Standards Radio Building where the first atomic clock was developed. |
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