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| Patents for Christian D. Cowgill | |||||
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| Number | Date | Patentee | Title | Type | |
| 315,388 | Apr. 07, 1885 | C.D. Cowgill | Plotter For Tinners' Use | squares | |
| 451,810 | May 05, 1891 | C.D. Cowgill | Bevel Attachment for Folding Rules | rule attachments | |