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| Patents Granted on 1825-05-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,120X | May 20, 1825 | E. Hale | Rotary steam engine | rotary steam engines | |
| 4,121X | May 20, 1825 | P. Reading | Thrashing grain and shelling corn | miller | |
| 4,122X | May 20, 1825 | R. Holden | Thrashing machine | miller | |