| All Patents in class 408/178 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
| | 180,869 | Aug. 08, 1876 | J. Thomson, E.E. Green | Devices for Cutting Screw Threads |
| | 209,774 | Nov. 12, 1878 | O. Pederson | Screw Cutting Die |
| | 564,700 | Jul. 28, 1896 | H. Kupsch | Open Die Head |
| | 587,715 | Aug. 10, 1897 | F.A. Errington | Automatic Extensible and Collapsible Adjustable Tap |
 | 1,090,299 | Mar. 17, 1914 | A.M. Harrington, R.F. Scott | Bolt-cutting machine |
| | 1,345,709 | Jul. 06, 1920 | A.A. Shafer | Threading Die Mechanism |
| | 1,345,710 | Jul. 06, 1920 | A.A. Shafer | Collapsible Tap |
| | 1,358,074 | Nov. 09, 1920 | W.H. Gates | Die Head |
| | 2,387,294 | Oct. 23, 1945 | H. Davies, C.A. Reimschissel | Thread-Cutting Mechanism |
 | 2,771,798 | Nov. 27, 1956 | H.R. De Vlieg | Grooving or facing head |
