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| All Patents in class 409/43 | |||||
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| Number | Date | Patentee | Title | Type | |
| 407,437 | Jul. 23, 1889 | G.B. Grant | Machine for Planing Gear Teeth | gear making machines | |
| 645,428 | Mar. 13, 1900 | E. Polanowski | Machine for Milling Angular Toothed Bevel Wheels | gear making machines | |
| 665,054 | Jan. 01, 1901 | H. Bilgram | Gear-cutting machine | gear making machines | |
| RE13,502 | Dec. 31, 1912 | H. Bilgram | Gear-cutting machine | gear making machines | |
| 1,587,709 | Jun. 08, 1926 | S.H. Earl | Gear-generating machine | gear making machines | |