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| All Patents in class 409/12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 333,488 | Dec. 29, 1885 | A. Swasey | Process of Cutting Teeth of Gear Wheels | gear making machines | |
| 618,978 | Feb. 07, 1899 | O.J. Beale | Machine for generating gearing | gear making machines | |
| 2,164,643 | Jul. 04, 1939 | J.C. Drader | Method of Cutting Tapered Spline | gear cutting tools | |