| File information |
| Filename: | us0d0003094-002.jpg |
| Keywords: | D0003094 / D7-544 / Underwood / Merrick / Dupee / Maple Leaf / 1868 |
| Inventor's Name: | George L. Underwood |
| Patent Date: | June 30, 1868 |
| Pattern Name/Number: | Unknown |
| Original Manufacturer: | Unknown |
| Date added: | Apr 19, 2019 |