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| Patents for Albert Pratt | |||||
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| Number | Date | Patentee | Title | Type | |
| 60,207 | Dec. 04, 1866 | H.C. Lewis | Improved Countersink Bit | countersinks | |
| 90,759 | Jun. 01, 1869 | H.C. Lewis | Single Twist Auger Bit | auger bits | |