| All Patents in class 451/21 |
Patents 1 -
10
of 23
      |
| Picture | Number | Date | Patentee | Title |
 | 781,434 | Jan. 31, 1905 | A.B. Landis | Automatic sizing mechanism for grinding-machines |
| | 957,936 | May 17, 1910 | C.M. Conradson | Grinding Machine Feeding Mechanism |
| | 1,535,080 | Apr. 21, 1925 | H.K. Spencer | Means For Controlling Feeding Mechanisms |
| | 1,891,662 | Dec. 20, 1932 | F.S. Haas, C. Booth | Machine Tool |
| | 1,954,442 | Apr. 10, 1934 | H. Ernst, A.H. Dall | Grinding Machine |
| | 1,991,953 | Feb. 19, 1935 | L.F. Nenninger | Grinding Machine |
| | 1,993,830 | Mar. 12, 1935 | R.E. Conover | Grinding Machine |
| | 1,997,551 | Apr. 09, 1935 | M. Romaine | Grinding Machine |
| | 2,005,332 | Jun. 18, 1935 | H.H. Asbridge | Internal grinding machine |
| | 2,049,611 | Aug. 04, 1936 | R.E. Harrison, C.W. Hopkins | Automatic Sizing Mechanism |
