File:Spiral derivation...png
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![File:Spiral derivation...png](https://upload.wikimedia.org/wikipedia/commons/thumb/2/26/Spiral_derivation...png/800px-Spiral_derivation...png)
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Original file (2,731 × 1,812 pixels, file size: 160 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:53, 25 September 2019 | ![]() | 2,731 × 1,812 (160 KB) | commons>Lichinsol | Cross-wiki upload from en.wikipedia.org |
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