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| All Patents in class 451/253 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | RE9,468 | Nov. 16, 1880 | W. Gleason | Machine for Cutting the Teeth of Metal Gears | |
| 2,119,298 | May 31, 1938 | A.W. Simowski | Gear Finishing Tool | ||