File:Uspatent820972.png
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![File:Uspatent820972.png](https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Uspatent820972.png/800px-Uspatent820972.png?20050103061726)
Size of this preview: 800 × 554 pixels. Other resolutions: 320 × 222 pixels | 640 × 443 pixels | 1,024 × 710 pixels | 1,280 × 887 pixels | 1,615 × 1,119 pixels.
Original file (1,615 × 1,119 pixels, file size: 75 KB, MIME type: image/png)