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| Patents Granted on 1812-04-01 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,697X | Apr. 01, 1812 | J. McDonald | Brick machine | brick and tile making machines | |
| 1,699X | Apr. 01, 1812 | W. Dunn | Preparing magnesia | ||
| FX-1,706 | Apr. 01, 1812 | I. Jennings | Suction pump and fire engine | fire engine pumps | |