File:USpatent1402643 1920.gif
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![File:USpatent1402643 1920.gif](https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/USpatent1402643_1920.gif/361px-USpatent1402643_1920.gif?20060413200814)
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Original file (880 × 1,461 pixels, file size: 36 KB, MIME type: image/gif)