| All Patents in class 451/242 |
Patents 31 -
45
of 109
      |
| Number | Date | Patentee | Title | Type |
| 1,814,431 | Jul. 14, 1931 | J.E. Caster | Grinding Machinery | grinding machines |
| 1,822,337 | Sep. 08, 1931 | J.E. Caster | Grinding Machinery | grinding machines |
| 1,822,348 | Sep. 08, 1931 | C.W. Hopkins | Grinding Machine | grinding machines |
| 1,835,668 | Dec. 08, 1931 | W. Peaslee | Grinding Machine | grinding machines |
| 1,837,821 | Dec. 22, 1931 | H.W. Holmes | Centerless Grinding Machine | grinding machines |
| 1,842,375 | Jan. 26, 1932 | S. Einstein | Grinding Machinery | grinding machines |
| 1,845,865 | Feb. 16, 1932 | L.F. Nenninger, S. Einstein | Machine Tool | grinding machines |
| 1,864,486 | Jun. 21, 1932 | S. Einstein | Art of Grinding | grinding machines |
| 1,871,866 | Aug. 16, 1932 | G.A. Volz | Grinding Machinery | grinding machines |
| 1,891,661 | Dec. 20, 1932 | G.W. Binns | Grinding | grinding machines |
| 1,891,662 | Dec. 20, 1932 | F.S. Haas, C. Booth | Machine Tool | grinding machines |
| 1,924,593 | Aug. 29, 1933 | G.W. Binns | Grinding Machine | grinding machines |
| 1,938,756 | Dec. 12, 1933 | C. Booth | Grinding Machine | grinding machines |
| 1,938,757 | Dec. 12, 1933 | F.S. Haas, S. Einstein | Grinding Machine | grinding machines |
| 1,938,765 | Dec. 12, 1933 | F.S. Haas | Grinding Machine | grinding machines |
