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| Patents for William M. Preston | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 316,912 | Apr. 28, 1885 | W.M. Preston | Frictional centering chuck for watch makers | |
 | 437,796 | Oct. 07, 1890 | W.M. Preston | Device to Facilitate the Drilling of Holes Centrally in Staffs for Watches, &c. | |