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| All Patents in class 407/22 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,274,466 | Aug. 06, 1918 | B.H. Bickle, A.L. Stewart | Gear Cutter | gear making machines | |
| 2,135,893 | Nov. 08, 1938 | E.C. Head | Gear cutter | gear hob cutters | |
| 2,270,003 | Jan. 13, 1942 | E.C. Head | Gear cutter | gear hob cutters | |
| RE22,891 | Jun. 24, 1947 | E.C. Head | Gear cutter | gear hob cutters | |