Image: Williams-tube
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Williams-tube.jpg (400 × 289 pixels, file size: 17 KB, MIME type: image/jpeg)
Description: A Williams tube
Title: Williams-tube
Credit: http://en.wikipedia.org/wiki/File:Williams-tube.jpg
Author: Sk2k52
Permission: trabajo propio
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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