| All Patents in class 451/117 |
Patents 31 -
45
of 64
      |
| Number | Date | Patentee | Title | Type |
| 1,206,589 | Nov. 28, 1916 | V. Pipshik | Valve-grinder | |
| 1,212,002 | Jan. 09, 1917 | B.B. Bean | Valve Grinding Tool | valve grinding tools |
| 1,244,526 | Oct. 30, 1917 | G.C. Boswell, L.G. Massicotte | Valve Grinder | valve grinding tools |
| 1,250,512 | Dec. 18, 1917 | J.B. Rose | Valve-Grinding Tool | valve grinding tools |
| 1,268,309 | Jun. 04, 1918 | E.B. White | Valve-grinding tool | |
| 1,284,127 | Nov. 05, 1918 | C.D. Miller | Grinder | |
| 1,313,601 | Aug. 19, 1919 | J.H. Just | Valve Grinder | valve grinding tools |
| 1,326,190 | Dec. 30, 1919 | A.D. Goodwin | Operating Means For Valve Grinding Tools | valve grinding tools |
| 1,347,243 | Jul. 20, 1920 | E.L. Beardsley | Valve Grinding Tool | valve grinding tools |
| 1,350,804 | Aug. 24, 1920 | P.P. Hinckley | Valve Grinder | valve grinding tools |
| 1,353,902 | Sep. 28, 1920 | C.W. Herberger | Driving Mechanism For Grinding Tools | valve grinding tools |
| 1,372,045 | Mar. 22, 1921 | R.G. Sedgewick | Valve grinder | handheld power tools |
| 1,396,861 | Nov. 15, 1921 | W.J. Lucks | Valve Grinder | valve grinding tools |
| 1,409,844 | Mar. 14, 1922 | H. Gartelman | Valve Grinding Tool | valve grinding tools |
| 1,421,486 | Jul. 04, 1922 | E.R. Jones | Operating Device For Valve Grinders | valve grinding tools |
