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| All Patents in class 451/400 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 222,901 | Dec. 23, 1879 | H.C. Heckendorn | Improvement in oval-lathes | |
| 1,430,624 | Oct. 03, 1922 | G.A. Carlson | Polishing machine | ||
| 1,674,973 | Jun. 26, 1928 | C.F. Clark, A.L. Kline | Grinding Machine | ||
| 2,392,651 | Jan. 08, 1946 | L.M. Davis | Work Supporting and Moving Mechanism | ||
| 2,418,223 | Apr. 01, 1947 | R.E. Flanders | Work Supporting and Moving Mechanism | ||
| 2,456,060 | Dec. 14, 1948 | C.G. Pardee, J.H. Hoern | Rotor Grinder | ||