| All Patents in class 451/221 |
Patents 16 -
30
of 68
      |
| Number | Date | Patentee | Title | Type |
| 1,394,418 | Oct. 18, 1921 | G.W. Lant | Grinding Machine | internal grinders |
| 1,395,393 | Nov. 01, 1921 | E.R. Conners | Mechanism for Truing and Dressing Grinding Wheels | grinder dressers |
| 1,395,394 | Nov. 01, 1921 | E.R. Conners | Mechanism for Truing and Dressing Grinding Wheels | grinder dressers |
| 1,445,875 | Feb. 20, 1923 | R.W. Ellingham, C.E. Van Norman | Grinding machine | vehicle mechanic |
| 1,515,568 | Nov. 11, 1924 | R.W. Ellingham, G.W. Fleming | Grinding machine | cylindrical grinders |
| 1,522,465 | Jan. 06, 1925 | G.C. Kimmel | Internal Grinding Machine | internal grinders |
| 1,534,302 | Apr. 21, 1925 | K.F. Gallimore, H.E. Kempton, P. Conradson | Grinding Machine | internal grinders |
| 1,535,452 | Apr. 28, 1925 | P. Conradson | Grinding Machine | internal grinders |
| 1,575,968 | Mar. 09, 1926 | W.L. Bryant | Grinding machine | grinders |
| 1,664,024 | Mar. 27, 1928 | J. de Koning | Grinding machine | |
| 1,672,117 | Jun. 05, 1928 | S. Einstein | Centralized Control for Grinders | grinding machines |
| 1,684,792 | Sep. 18, 1928 | S. Einstein | Grinding Machine Having Balanced Spindle | grinding machines |
| 1,698,953 | Jan. 15, 1929 | L.W. Moulton, O.C. Kavle | Gear-Finishing Machine | gear making machines |
| 1,919,144 | Jul. 18, 1933 | C. Booth | Grinding Machine | grinding machines |
| 1,932,969 | Oct. 31, 1933 | J.E. Caster, C.W. Hopkins | Grinding Machine | grinding machines |
