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| Patents for Francis J. Gay | |||||
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| Number | Date | Patentee | Title | Type | |
| 403,529 | May 21, 1889 | F.J. Gay | Expansible Mandrel | mandrels and arbors | |
| 511,607 | Dec. 26, 1893 | F.J. Gay | Cutter for Gear Wheels | milling machine cutters | |