File:USpatent732591 1903.gif
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![File:USpatent732591 1903.gif](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/USpatent732591_1903.gif/675px-USpatent732591_1903.gif?20050507191604)
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Original file (1,503 × 1,335 pixels, file size: 57 KB, MIME type: image/gif)