File:USpatent2528639 1948.gif
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![File:USpatent2528639 1948.gif](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/USpatent2528639_1948.gif/402px-USpatent2528639_1948.gif?20050208210611)
Size of this preview: 402 × 599 pixels. Other resolutions: 161 × 240 pixels | 322 × 480 pixels | 515 × 768 pixels | 687 × 1,024 pixels | 1,326 × 1,975 pixels.
Original file (1,326 × 1,975 pixels, file size: 70 KB, MIME type: image/gif)