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| Patent US21,961 | |||||
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| Number | Date | Patentee | Title | Type | |
| 21,961 | Nov. 02, 1858 | W.O. Hickok | Die for Cutting Wooden Screws | drill accessories | |
| CA-21,961 | Jul. 02, 1885 | J.T. Milne, D.F. Milne | Saw mill | sawmill carriages | |