| All Patents in class 74/320 |
Patents 1 -
14
of 14
      |
| Number | Date | Patentee | Title | Type |
| 918,050 | Apr. 13, 1909 | R.H. Hazeltine | Valve Grinding Device | valve grinding tools |
| 930,472 | Aug. 10, 1909 | F.I. Harding | Valve Grinder | valve grinding tools |
| 930,620 | Aug. 10, 1909 | J.R. Sandberg | Combined breast-drill and valve-grinder | breast drills |
| 963,986 | Jul. 12, 1910 | F.C. Blanchard | Combination drill and valve-grinder | eggbeater drills |
| 1,015,902 | Jan. 30, 1912 | N.E. Meredith | Valve Grinder | valve grinding tools |
| 1,017,242 | Feb. 13, 1912 | A.B. Browne | Combined Breast Drill and Valve Grinder | combination tools |
| 1,023,959 | Apr. 23, 1912 | K. Peterson | Sector Cutting Saw | making wrenches |
| 1,161,070 | Nov. 23, 1915 | H.M. Neer | Valve Grinder | valve grinding tools |
| 1,282,018 | Oct. 22, 1918 | F.O. Albertson | Valve Grinder | valve grinding tools |
| 1,326,190 | Dec. 30, 1919 | A.D. Goodwin | Operating Means For Valve Grinding Tools | valve grinding tools |
| 1,353,902 | Sep. 28, 1920 | C.W. Herberger | Driving Mechanism For Grinding Tools | valve grinding tools |
| 1,441,032 | Jan. 02, 1923 | J.W. Schab | Valve Grinder | valve grinding tools |
| 1,564,017 | Dec. 01, 1925 | J.C. Pewther | Valve Grinder | valve grinding tools |
| 1,751,657 | Mar. 25, 1930 | N.F. McNaught, E.H. Peterson | Operating mechanism for valve grinders | |
