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| Patents for William H. Preston | |||||
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| Number | Date | Patentee | Title | Type | |
| 381,525 | Apr. 24, 1888 | A.H. Brainard | Milling Machine | milling machines | |
| 632,847 | Sep. 12, 1899 | W.H. Preston | Wrench | quick adjust wrenches | |
| CA-65,166 | Dec. 01, 1899 | W.H. Preston | Wrench | quick adjust wrenches | |
| 728,007 | May 12, 1903 | W.H. Preston | Wrench | quick adjust wrenches | |