| | ||
| Home| FAQ | Search:Advanced|Person|Company| Type|Class | Login | |
| Quick search: | ||
| Patents Granted on 1821-04-23 | |||||
      | |||||
| Number | Date | Patentee | Title | Type | |
| 3,328X | Apr. 23, 1821 | E.A. Stevens, R.L. Stevens | Cast iron ploughs | plows | |
| 3,329X | Apr. 23, 1821 | R.L. Stevens, E.A. Stevens | Hardening part of the edge of the share of ploughs | plows | |