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| Patents for Fred Leon Gregory | |||||
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| Number | Date | Patentee | Title | Type | |
| 327,791 | Oct. 06, 1885 | F.L. Gregory | Eccentric chuck | metal lathe chucks | |
| 374,405 | Dec. 06, 1887 | F.L. Gregory | Lathe Chuck | metal lathe chucks | |