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| All Patents in class 470/187 | |||||
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| Number | Date | Patentee | Title | Type | |
| 269,153 | Dec. 12, 1882 | F. Armstrong | Thread Cutting Die | taps and dies | |
| 565,746 | Aug. 11, 1896 | J. Hartness | Screw Cutting Die | taps and dies | |
| 1,076,188 | Oct. 21, 1913 | B. Borden | Thread-cutting tool | taps and dies | |
| 1,988,046 | Jan. 15, 1935 | L. Nikoloff | Thread cutting die | tap wrenches and die stocks | |
| 2,029,847 | Feb. 04, 1936 | W.W. Vosper | Threading and Facing Tool | tap and die holders | |