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| All Patents in class 409/57 | |||||
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| Number | Date | Patentee | Title | Type | |
| 842,989 | Feb. 05, 1907 | R.T. Wingo | Spiral Cutting Machine | metalworking machines | |
| 991,464 | May 02, 1911 | C.E. Bilton | Gear-cutting machine | gear making machines | |
| 1,283,693 | Nov. 05, 1918 | C.E. Derr | Machine for Cutting Gears | gear making machines | |
| 2,161,268 | Jun. 06, 1939 | W.F. Zimmermann | Conoidal Bit Cutting Machine | gear hobbing machines | |
| 4,463,488 | Aug. 07, 1984 | D.J. Pieczulewski | Indexing work table | indexers and dividers | |