| All Patents in class 408/226 |
Patents 16 -
30
of 35
      |
| Number | Date | Patentee | Title | Type |
| 1,264,370 | Apr. 30, 1918 | L. Groff | Drill | metalworking twist drills |
| 1,283,740 | Nov. 05, 1918 | C.B. Groff | Drill | |
| 1,712,876 | May 14, 1929 | J.V. Dolezal | Wire-Threading Bit | hollow bits |
| 2,029,447 | Feb. 04, 1936 | H.M. Swain | Auger Bit | auger bits |
| 2,289,583 | Jul. 14, 1942 | F.J. Malone | Tool Holder | metalworking machine tool holders |
| 2,345,462 | Mar. 28, 1944 | D.J. Coughlin | Cutting Tool Holder | milling machine accessories |
| 2,449,103 | Sep. 14, 1948 | H.P. Boggis | Tap driver | tapping heads and chucks |
| 2,555,302 | Jun. 05, 1951 | G.H. Cogsdill | Twist Drill | metalworking twist drills |
| 2,640,378 | Jun. 02, 1953 | R.W. Haggar | Boring Head Construction | boring heads |
| 2,689,131 | Sep. 14, 1954 | D.E. Priest | Screwdriver with removable blade | screwdriver blades |
| 2,752,965 | Jul. 03, 1956 | B.A. Mackey | Drill bit construction | wood drill bits |
| 2,794,468 | Jun. 04, 1957 | R.W. Huxtable | Woodcutting bit assembly | wood drill bits |
| 2,893,274 | Jul. 07, 1959 | F.H. Mueller | Tool Holder | drilling and boring tool holders |
| 3,052,999 | Sep. 11, 1962 | C.B. Sipek, R.K. Sedgwick | Identifying Means for Tools | milling machine tools |
| 3,053,118 | Sep. 11, 1962 | J.A. Lavallee | Method of manufacturing reamers | reamers |
