| All Patents in class 451/415 |
Patents 1 -
15
of 22
      |
| Number | Date | Patentee | Title | Type |
| 79,818 | Jul. 14, 1868 | S. Farrenburg | Improvement in Tool-Sharpeners | sharpening machines |
| 220,911 | Oct. 28, 1879 | L.D. Cogswell | Grinder | metal lathe accessories and attachments |
| 325,373 | Sep. 01, 1885 | E.J. Worcester | Drill-grinding attachment for drilling-machines | woodworking post drills |
| 626,436 | Jun. 06, 1899 | E. Mills | Grinding Machine | tool grinders |
| 712,537 | Nov. 04, 1902 | C.S. Hisey | Electric grinding device | handheld power tools |
| 828,425 | Aug. 14, 1906 | H.U. Ruedy | Tool for notching bung-holes | cooper |
| 998,088 | Jul. 18, 1911 | W.F. Groene, H.C. Pierle | Hob-grinding attachment | cutter grinding machines |
| 1,040,715 | Oct. 08, 1912 | H. Mann | Centering Device | center finders |
| 1,252,634 | Jan. 08, 1918 | G.J. Walker | Gage | surface gauges |
| 1,259,132 | Mar. 12, 1918 | E. Ritz, Jr. | Portable electric tool | handheld grinders |
| 1,658,185 | Feb. 07, 1928 | R.L. Carter | Tool-grinding mechanism | woodworking machine sharpening mechanisms |
| 1,794,149 | Feb. 24, 1931 | J.G. Collins | Stand and control means for electric portable drills | |
| 1,902,629 | Mar. 21, 1933 | W.F. Evans | Drum Truing Machine | |
| 1,975,985 | Oct. 09, 1934 | B.F. Stowell | Method and apparatus for grinding valve seats | valve and seat maintenance |
| 2,125,442 | Aug. 02, 1938 | F.P. Healy | Valve regrinding device | valve and seat maintenance |
