| All Patents in class 451/331 |
Patents 16 -
30
of 36
      |
| Number | Date | Patentee | Title | Type |
| 1,850,373 | Mar. 22, 1932 | C. Booth | Grinding Machine | grinding machines |
| 1,851,265 | Mar. 29, 1932 | T. Zimmerman, S.A. Strickland | Feeding Mechanism for Grinders | grinding machines |
| 1,877,515 | Sep. 13, 1932 | C.G. Liljeberg | Grinding Machine | grinding machines |
| 2,035,163 | Mar. 24, 1936 | K.W. Holmberg | Tool Holder and Guide | sharpening tool holders |
| 2,308,739 | Jan. 19, 1943 | G.W. Binns | Centerless Grinder | grinding machines |
| 2,535,439 | Dec. 26, 1950 | J. McEwan | Saw sharpener | saw sharpening machines |
| 2,635,395 | Apr. 21, 1953 | P.A. Grobey, M.H. Arms | Machine for grinding internal surfaces concentric with external surfaces | grinders |
| 2,819,563 | Jan. 14, 1958 | W.K. Lowe | Billet grinder | grinders |
| 2,821,818 | Feb. 04, 1958 | W.S. Swanson, H.E. McGee | Lapping Machine and Automatic Feed Mechanism Therefor | lapping machines |
| 2,835,085 | May 20, 1958 | J.F. Manting | Magnetic dial feeder | |
| 2,912,795 | Nov. 17, 1959 | M.E. Aston, W.F. Jessup | Transfer Mechanism | workpiece changers and storage mechanisms |
| 2,914,890 | Dec. 01, 1959 | W.A. Hoier | Work Handling and Indexing Mechanism | centerless grinders |
| 2,958,989 | Nov. 08, 1960 | R.F. Pendergast | Spreading and feeding assembly | sanding machines |
| 2,976,650 | Mar. 28, 1961 | B.H. Steinhard | Machine Tool Workpiece Loading System | centerless grinders |
| 3,009,295 | Nov. 21, 1961 | F.W. Egbert, W.B. Seidel | Machine Tool Loading Mechanism | workpiece changers and storage mechanisms |
