| All Patents in class 451/21 |
Patents 1 -
15
of 23
      |
| Number | Date | Patentee | Title | Type |
| 781,434 | Jan. 31, 1905 | A.B. Landis | Automatic sizing mechanism for grinding-machines | grinders |
| 957,936 | May 17, 1910 | C.M. Conradson | Grinding Machine Feeding Mechanism | grinding machines |
| 1,535,080 | Apr. 21, 1925 | H.K. Spencer | Means For Controlling Feeding Mechanisms | surface grinders |
| 1,891,662 | Dec. 20, 1932 | F.S. Haas, C. Booth | Machine Tool | grinding machines |
| 1,954,442 | Apr. 10, 1934 | H. Ernst, A.H. Dall | Grinding Machine | grinding machines |
| 1,991,953 | Feb. 19, 1935 | L.F. Nenninger | Grinding Machine | grinding machines |
| 1,993,830 | Mar. 12, 1935 | R.E. Conover | Grinding Machine | grinding machines |
| 1,997,551 | Apr. 09, 1935 | M. Romaine | Grinding Machine | grinding machines |
| 2,005,332 | Jun. 18, 1935 | H.H. Asbridge | Internal grinding machine | |
| 2,049,611 | Aug. 04, 1936 | C.W. Hopkins, R.E. Harrison | Automatic Sizing Mechanism | grinding machines |
| 2,641,876 | Jun. 16, 1953 | B.A. Kearns, J. Decker | Precision Grinding Machine | cylindrical grinders |
| 2,929,172 | Mar. 22, 1960 | J.H. Pasell | Machine for cutting a succession of workpieces to a predetermined size | grinders |
| 2,986,854 | Jun. 06, 1961 | J. Ross | Automatic timing and indexing mechanism for wheel wear adjustment | polishing and buffing machinery |
| 3,060,647 | Oct. 30, 1962 | G.L. Grove, A.H. Dall | Phase-Out Device for Grinding Machine | centerless grinders |
| 3,089,293 | May 14, 1963 | M.V. Waters, G.W. Marshall, W.A. Hoier | Automatic Control Mechanism for Roll Grinder | roll grinding machines |
