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| All Patents in class 409/259 | |||||
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| Number | Date | Patentee | Title | Type | |
| 275,393 | Apr. 10, 1883 | L.J. Knowles | Machine for Forming Key-Seats in Hubs of Gears, &c. | metalworking machines | |
| 685,772 | Nov. 05, 1901 | J.N. Lapointe | Key-seat cutter | key seating machines | |
| 876,277 | Jan. 07, 1908 | J.N. Lapointe | Key-seat-broaching machine | key seating machines | |
| 2,551,359 | May 01, 1951 | M. Wahlstrom, R.F. Bannow | Slotting Machine Operating at Universal Angles in Overall Locations | milling machine accessories | |