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| Patents for Willard Foster | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,320X | Jan. 25, 1826 | W. Foster | Washing machine | washing machines | |
| 4,321X | Jan. 25, 1826 | W. Foster | Machine for sawing shingles | shingle machines | |
| 6,509X | Apr. 22, 1831 | W. Foster | Stump machine | stump elevators | |