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| All Patents in class 408/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 924,963 | Jun. 15, 1909 | B. Borden | Pipe Threading Tool | tap and die holders | |
| 1,076,188 | Oct. 21, 1913 | B. Borden | Thread-cutting tool | taps and dies | |
| 1,536,659 | May 05, 1925 | R.L. Carter | Adjustable cutter head | cutterheads | |
| 1,603,280 | Oct. 19, 1926 | L.S. Hall | Die Head for Threading Machines and the Like | tap and die holders | |
| 1,936,112 | Nov. 21, 1933 | J.V. Jardine | Pipe threading apparatus | ||
| 2,120,638 | Jun. 14, 1938 | J.R. Yotta | Boring Head | boring heads | |