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| Patents Granted on 1823-05-06 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,690X | May 06, 1823 | L. Norcross | Machine for dressing mill stones | mill stone dressers | |
| 3,691X | May 06, 1823 | J. Lacey | Piston and valve cock | ||
| 3,692X | May 06, 1823 | J. Paddleford | Forcing pump | pumps | |