File:Heike Kamerlingh Onnes and Johannes Diderik van der Waals.jpg
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| Description | Johannes Diderik van der Waals (right) and Heike Kamerlingh Onnes in Leiden in front of the helium-‘liquefactor’ http://www.science.uva.nl/research/itf/history.php |
| Date | |
| Source | http://www.science.uva.nl/research/itf/images/vdwaals_large.jpg |
| Author | Unknown author |
| Permission (Reusing this file) |
PD by age |
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighbouring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:48, 4 November 2013 | | 691 × 980 (216 KB) | wikimediacommons>Quibik | Removed moire caused by halftone. |
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