| All Patents in class 451/243 |
Patents 1 -
10
of 17
      |
| Picture | Number | Date | Patentee | Title |
 | 1,249,632 | Dec. 11, 1917 | H.R. Isler | Grinding-machine |
| | 1,733,087 | Oct. 22, 1929 | L.R. Heim | Grinding Apparatus |
| | 1,733,492 | Oct. 29, 1929 | E.R. Seward, F.M. Kern | Grinding Machine |
| | 1,776,241 | Sep. 16, 1930 | F.S. Haas, J.E. Caster | Grinding Machinery |
| | 1,779,467 | Oct. 28, 1930 | S. Einstein | Process of Grinding |
| | 1,791,442 | Feb. 03, 1931 | J.E. Caster | Grinding Machine |
| | 1,814,361 | Jul. 14, 1931 | C. Booth | Grinding Machinery |
| | 1,814,365 | Jul. 14, 1931 | C. Booth | Grinding Machinery |
| | 1,847,588 | Mar. 01, 1932 | C. Booth | Grinding Machine |
| | 1,952,182 | Mar. 27, 1934 | B.R. Purvin | Grinding Machine |
