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| Patents for Charles F. Preston | |||||
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| Number | Date | Patentee | Title | Type | |
| 641,997 | Jan. 23, 1900 | C.F. Preston | Tool Holder | lathe tool holders and tool posts | |
| 699,708 | May 13, 1902 | C.F. Preston | Tool Holder | lathe tool holders and tool posts | |