File:USpatent no1920705from1930.gif
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![File:USpatent no1920705from1930.gif](https://upload.wikimedia.org/wikipedia/commons/thumb/8/88/USpatent_no1920705from1930.gif/422px-USpatent_no1920705from1930.gif?20060911205217)
Size of this preview: 422 × 600 pixels. Other resolutions: 169 × 240 pixels | 338 × 480 pixels | 540 × 768 pixels | 720 × 1,024 pixels | 1,364 × 1,939 pixels.
Original file (1,364 × 1,939 pixels, file size: 43 KB, MIME type: image/gif)