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| Patents for Francis Curtis | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 120,044 | Oct. 17, 1871 | F. Curtis | Improvement in machines for making machine screws | |
 | RE9,086 | Feb. 17, 1880 | F. Curtis | Machine for making machine-screws | |
 | 280,296 | Jun. 26, 1883 | F. Curtis, A.B. Curtis | Metal-screw machine | |