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| Patents for Automatic Pencil Sharpener Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 832,054 | Oct. 02, 1906 | E.N. Gilfillan | Pencil-sharpener | pencil sharpeners | |
| 868,028 | Oct. 15, 1907 | C.C. Spengler | Pencil Sharpener | pencil sharpeners | |
| 889,056 | May 26, 1908 | C.C. Spengler | Pencil-sharpener | pencil sharpeners | |