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| File information | |
| Filename: | us0d0004921-001.jpg |
| Keywords: | Cambridge / Massachusetts / Middlesex / Francis Gould / M. W. Frothingham |
| Inventor's Name: | George B. Fowle |
| Patent Date: | May 23, 1871 |
| Pattern Name/Number: | Unknown |
| Original Manufacturer: | Unknown |
| Date added: | Apr 20, 2019 |