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| Patents Granted on 1820-01-28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,169X | Jan. 28, 1820 | I. Town | Truss Bridge | ||
| 3,170X | Jan. 28, 1820 | J. Kendall | Apparatus for preparing the oxy muriate of lime | ||