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| All Patents in class 409/47 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 749,683 | Jan. 12, 1904 | H. Bilgram | Process of shaping gear-teeth | |
 | 1,222,709 | Apr. 17, 1917 | W.F. Zimmermann | Gear-generating machine | |
| 1,266,839 | May 21, 1918 | M. Maag | Gear Cutting Machine | ||
 | 1,270,183 | Jun. 18, 1918 | M. Maag | Gear Cutting Machine | |
 | 1,422,462 | Jul. 11, 1922 | W. Owen, J.H. Melloy | Gear Cutting, Slotting, and Like Machine | |
 | 1,477,562 | Dec. 18, 1923 | R.L. Hibbard, F.W. Wappat | Gear cutting | |