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| All Patents in class 409/39 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 638,216 | Dec. 05, 1899 | J.S. Copeland | Gear-cutting machine | ||
| 780,314 | Jan. 17, 1905 | L.T. Weiss | Rack Cutting Apparatus | ||
| 806,075 | Nov. 28, 1905 | T. Fawcus | Spiral Gear Cutting Machine | ||
| 1,092,571 | Apr. 07, 1914 | C.J. Halborg | Machine for Backing Off Hobs or Cutters for Cutting Gears | ||
| 1,279,278 | Sep. 17, 1918 | M.O. Cross | Gear Toot Rounder | ||
| 2,348,845 | May 16, 1944 | H. Pelphrey | Machine for Forming Gears | ||