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| Patents for W. T. Dwinnell | |||||
| Number | Date | Patentee | Title | Type | |
| 240,284 | Apr. 19, 1881 | M.A. Hamilton, A.J. Taylor | Calf Weaner | animal weaners | |
| 257,253 | May 02, 1882 | M.A. Hamilton, A.W. Taylor | Calf Weaner | animal weaners | |