| All Patents in class 82/172 |
Patents 16 -
24
of 24
      |
| Number | Date | Patentee | Title | Type |
| 1,198,697 | Sep. 19, 1916 | J.W. Brooks | Valve Cutting Machine | valve grinding tools |
| 1,237,165 | Aug. 14, 1917 | J.W. Brooks | Valve Refacing Tool | valve grinding tools |
| 1,285,573 | Nov. 26, 1918 | F.O. Albertson | Refacing Tool for Puppet-Valves | valve grinding tools |
| 1,301,891 | Apr. 29, 1919 | F.O. Albertson | Valve Refacing Tool | valve grinding tools |
| 1,339,791 | May 11, 1920 | F.D. Hatfield, A.C. Savidge | Valve Lathe | metal lathes |
| 1,517,176 | Nov. 25, 1924 | H.M. Shepherd | Device for truing valves | valve and seat maintenance |
| 1,603,478 | Oct. 19, 1926 | R.E. Lees | Valve resurfacing mechanism | handheld power tools |
| 1,707,670 | Apr. 02, 1929 | A.C. Savidge | Valve Facing Tool | valve facing tool |
| 5,125,299 | Jun. 30, 1992 | D.S. Strait | Portable Machine Tool | portable metal drilling machines |
