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| All Patents in class 409/17 | |||||
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| Number | Date | Patentee | Title | Type | |
| 575,393 | Jan. 19, 1897 | U. Eberhardt, H.E. Eberhardt, F.L. Eberhardt | Gear-cutting machine with safety-stop | gear making machines | |
| 1,221,303 | Apr. 03, 1917 | W.F. Folmer | Gear Cutting Machine | gear making machines | |