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| All Patents in class 451/205 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,265,956 | May 14, 1918 | C. Rauch | Razor Blade Sharpener | cutler | |
| 1,269,831 | Jun. 18, 1918 | R.C. McCaleb | Razor Sharpening Machine | cutler | |
| 1,281,401 | Oct. 15, 1918 | J. Legg | Razor Blade Sharpener | cutler | |