| All Patents in class 408/151 |
Patents 16 -
30
of 31
      |
| Number | Date | Patentee | Title | Type |
| 1,287,971 | Dec. 17, 1918 | N.H. Groff | Tool Holder | lathe tool holders and tool posts |
| 1,331,322 | Feb. 17, 1920 | A. Connell | Tool Holder for Lathes | lathe tool holders and tool posts |
| 1,344,908 | Jun. 29, 1920 | A.B. Landis | Cutter-head | |
| 1,394,845 | Oct. 25, 1921 | V.R. Koontz | Die-head | taps and dies |
| 1,858,390 | May 17, 1932 | R.R. Finn, E.T. Bysshe | Torsion Released Die | taps and dies |
| 1,979,024 | Oct. 30, 1934 | R.R. Finn, E.T. Bysshe | Screw Threading Die | taps and dies |
| 2,034,453 | Mar. 17, 1936 | H. Wiener | Tool Holder | metalworking machine tool holders |
| 2,211,321 | Aug. 13, 1940 | D.C. Eipper | Retractable Tool Holder | drilling and boring tool holders |
| 2,292,788 | Aug. 11, 1942 | M.W. Lamprecht | Threading machine die head | metal threading machines |
| 2,775,147 | Dec. 25, 1956 | T.E. Crawford, E. Schneebeli | Taper Boring Device | vertical boring mills |
| 2,867,139 | Jan. 06, 1959 | H.J. Caldwell | Boring unit | |
| 2,931,254 | Apr. 05, 1960 | J.W. Birney, O.R. Birney, Jr. | Boring Head | boring heads |
| 3,044,323 | Jul. 17, 1962 | A.N. Sweeny | Adjustable boring head | boring heads |
| 3,125,903 | Mar. 24, 1964 | J.W. Birney, O.R. Birney, Jr. | Eccentric Boring Head | boring heads |
| 3,250,155 | May 10, 1966 | H.F. Armstrong | Recessing Tool | milling machine cutters |
