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| All Patents in class 451/196 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,280,284 | Oct. 01, 1918 | W.E. Nickerson | Blade Holding Mechanism for Blade Sharpening Machines | sharpening machines | |
| 1,995,536 | Mar. 26, 1935 | A.J. Dremel | Razor blade sharpener | sharpening machines | |