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| All Patents in class 409/272 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,467,525 | Sep. 11, 1923 | O.H. Banker | Broaching machine | broaching machines | |
| 2,132,540 | Oct. 11, 1938 | G.R. Squibb, H.L. Pope | Broaching Machine | broaching machines | |
| 2,280,229 | Apr. 21, 1942 | H.J. Siekmann, W.F. Groene | Multiple Spindle Broaching Lathe | crankshaft lathes | |