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| Patents for O. N. Willis | |||||
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| Number | Date | Patentee | Title | Type | |
| 388,334 | Aug. 21, 1888 | O. Peck, G.H. Bartlett | Tool Holding Box | tool storage | |
| 394,879 | Dec. 18, 1888 | F.V. Phillips | Mortising-machine | mortising machines | |