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| All Patents in class 451/322 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,255,656 | Feb. 05, 1918 | J.B. Steedman | Razor Sharpener | cutler | |
| 1,266,183 | May 14, 1918 | H.A. Vincent | Device for Sharpening Safety Razor Blades | cutler | |
| 1,271,930 | Jul. 09, 1918 | A. Newhouse | Blade Sharpener | ||