| All Patents in class 451/242 |
Patents 16 -
30
of 109
      |
| Number | Date | Patentee | Title | Type |
| 1,691,061 | Nov. 13, 1928 | L.R. Heim | Grinding Device | grinding machines |
| 1,692,834 | Nov. 27, 1928 | L.R. Heim | Art and Apparatus for Producing Ground Articles | grinding machines |
| 1,709,348 | Apr. 16, 1929 | L.R. Heim | Method and Apparatus for Producing Ground Articles | grinding machines |
| 1,722,386 | Jul. 30, 1929 | C.H. Norton | Centerless Grinding Machine | grinding machines |
| 1,733,086 | Oct. 22, 1929 | E. Sobolewski | Centerless Grinder | centerless grinders |
| 1,733,090 | Oct. 22, 1929 | H.W. Holmes | Centerless Grinder | grinding machines |
| 1,735,867 | Nov. 19, 1929 | F.M. Kern | Grinding Machine | grinding machines |
| 1,737,852 | Dec. 03, 1929 | F.M. Kern | Centerless Grinding Machine | grinding machines |
| 1,741,236 | Dec. 31, 1929 | L.R. Heim | Grinding | grinding machines |
| 1,782,480 | Nov. 25, 1930 | E.R. Seward | Centerless Grinding Machine | grinding machines |
| 1,787,337 | Dec. 30, 1930 | C. Booth | Grinding Machine | grinding machines |
| 1,788,046 | Jan. 06, 1931 | C. Booth, G.W. Binns | Roll-End Grinder | grinding machines |
| 1,804,197 | May 05, 1931 | L.F. Nenninger, W.D. Archea, G.W. Binns | Centerless Grinding | grinding machines |
| 1,814,209 | Jul. 14, 1931 | S. Einstein | Centerless Grinding Machine | grinding machines |
| 1,814,367 | Jul. 14, 1931 | J.E. Caster | Long Bar Grinder | grinding machines |
