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| All Patents in class 409/26 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,203,608 | Nov. 07, 1916 | E.W. Bullock, A.L. Stewart, J.E. Gleason | Gear Cutting Machine | gear making machines | |
| 1,383,707 | Jul. 05, 1921 | W.C. Farnum | Art of making gear-cutters | ||
| 4,534,684 | Aug. 13, 1985 | B.H. Johnson | Apparatus For Milling A Gear For A Double Enveloping Worm Gear Drive | ||