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| Patents Granted on 1819-07-31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,120X | Jul. 31, 1819 | J. Idler | Construction of engines generally | ||
| 3,121X | Jul. 31, 1819 | E. Tisdale | Machine for cleaning wheat, etc. from smut | miller | |