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| All Patents in class 72/31.01 | |||||
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| Number | Date | Patentee | Title | Type | |
| 173,510 | Feb. 15, 1876 | E.J. Soligny | Machine for Embossing and Chasing Metal | embossing and knurling machines | |
| 1,890,923 | Dec. 13, 1932 | C.H. Wilson | Test piece support for hardness testers | metal hardness testers | |
| 3,124,017 | Mar. 10, 1964 | W.K. Behrendt, W.E. Brainard | Automatic Multiple Spindle Drilling Machine | multiple spindle drill presses | |