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| All Patents in class 409/9 | |||||
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| Number | Date | Patentee | Title | Type | |
| 909,719 | Jan. 12, 1909 | R.B. Weaver | Apparatus for Chamfering Gear Teeth | gear making machines | |
| 1,063,160 | May 27, 1913 | B.M. Hanson | Forming Machine | milling machines | |
| 1,216,454 | Feb. 20, 1917 | A.J. Gosselin, A.H. Ingle | Gear Tooth Rounding Machine | gear making machines | |