File:USPatent 6752231.png
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![File:USPatent 6752231.png](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/USPatent_6752231.png/694px-USPatent_6752231.png)
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current | 18:48, 13 May 2015 | ![]() | 1,169 × 1,010 (57 KB) | commons>BD2412 | Transferred from en.wikipedia |
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