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| All Patents in class 409/40 | |||||
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| Number | Date | Patentee | Title | Type | |
| 547,571 | Oct. 08, 1895 | H.C. Warren | Apparatus for cutting gear-teeth | gear making machines | |
| 588,738 | Aug. 24, 1897 | H.C. Warren | Machine for generating gear-teeth | gear making machines | |
| 605,982 | Jun. 21, 1898 | H.C. Warren | Machine for generating gear-teeth | gear making machines | |
| 4,534,684 | Aug. 13, 1985 | B.H. Johnson | Apparatus For Milling A Gear For A Double Enveloping Worm Gear Drive | ||