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