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| Patents for Frank W. Clapp | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 135,515 | Feb. 04, 1873 | M.T. Boult | Improvement in apparatus for turning ovals | |
 | 372,073 | Oct. 25, 1887 | O.A. Kelsey | Sheathing-lath machine | |