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| Patents for Hamlet S. Briggs | |||||
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| Number | Date | Patentee | Title | Type | |
| RE9,468 | Nov. 16, 1880 | W. Gleason | Machine for Cutting the Teeth of Metal Gears | gear making machines | |
| RE9,469 | Nov. 16, 1880 | W. Gleason | Machine for Cutting Teeth of Wooden Gears | specialty woodworking machines | |