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| All Patents in class 144/28.71 | |||||
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| Number | Date | Patentee | Title | Type | |
| 291,597 | Jan. 08, 1884 | J. Hoffman | Pencil-sharpener | pencil sharpeners | |
| 556,709 | Mar. 17, 1896 | G.F. Ballou | Pencil-sharpening machine | pencil sharpeners | |
| 972,488 | Oct. 11, 1910 | R.A. Wilson | Pencil-pointer | pencil sharpeners | |