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| All Patents in class 144/28.7 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 291,597 | Jan. 08, 1884 | J. Hoffman | Pencil-sharpener | |
 | 350,330 | Oct. 05, 1886 | A.S. Vedder | Pencil-sharpener | |
 | 431,422 | Jul. 01, 1890 | J. Watrous | Pencil-sharpener | |
 | 640,846 | Jan. 09, 1900 | J.A. Webster | Pencil-sharpener | |
 | 648,900 | May 01, 1900 | G.R. Eager | Sharpening device for pencils, &c. | |
 | 819,104 | May 01, 1906 | J.A. Webster | Pencil-sharpener | |
 | 961,392 | Jun. 14, 1910 | A.S. Wheeler | Pencil-sharpening machine | |