File:USPatent4151431-2.png
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![File:USPatent4151431-2.png](https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/USPatent4151431-2.png/393px-USPatent4151431-2.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:48, 13 May 2015 | ![]() | 420 × 640 (153 KB) | commons>BD2412 | Transferred from en.wikipedia |
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