File:USpatent no1920705from1930.gif
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)