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| Patents for Chicago Screw Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 168,643 | Oct. 11, 1875 | J.D. Huntington | Improvement in tools for turning emery-wheels | |
 | CA-6,521 | Sep. 07, 1876 | J.D. Huntington | Emery-wheel dresser | |