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| Patents for Augustus Day | |||||
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| Picture | Number | Date | Patentee | Title | |
| 463X | Jun. 15, 1803 | W. Bache, A. Day, I. Todd | Physiognotrace | ||
| 1,416X | Jan. 19, 1811 | A. Day | Improvement in the sleigh | ||
| 1,417X | Jan. 19, 1811 | A. Day | New power by combustion and explosion | ||
 | 21,490 | Sep. 14, 1858 | A. Day | Shingle-machine | |