| All Patents in class 408/142 |
Patents 16 -
24
of 24
      |
| Number | Date | Patentee | Title | Type |
| 1,560,462 | Nov. 03, 1925 | R.A. Boehm | Self Opening and Closing Threading Die Holder | tap and die holders |
| 1,615,676 | Jan. 25, 1927 | C.W. Bettcher | Die Head | tap and die holders |
| 1,777,380 | Oct. 07, 1930 | A.J. Prance | Thread-cutting die | tapping heads and chucks |
| 1,804,459 | May 12, 1931 | R.R. Finn, E.T. Bysshe | Screw-Cutting Die | tapping heads and chucks |
| 1,858,390 | May 17, 1932 | R.R. Finn, E.T. Bysshe | Torsion Released Die | taps and dies |
| 1,936,274 | Nov. 21, 1933 | G.E. Shafer | Die | taps and dies |
| 2,299,302 | Oct. 20, 1942 | E.P. Bullard, A.C. Lindmark | Attachment for Machine Tools | |
| 2,333,163 | Nov. 02, 1943 | R.R. Finn | Automatic Die | taps and dies |
| 3,052,900 | Sep. 11, 1962 | H.H. van der Velden | Thread Length Control Device for Pipe Threaders | pipe threading machines |
