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| All Patents in class 451/385 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,993,831 | Mar. 12, 1935 | A.H. Dall | Apparatus for Producing Surfaces of Revolution Eccentric to One Another | grinding machines | |
| 2,752,801 | Jul. 03, 1956 | E.T. Olson | Fluid actuated clamp | work holding | |
| 2,932,524 | Apr. 12, 1960 | R.B. Pealer | Automatic Chuck | pipe threading machines | |
| 4,987,701 | Jan. 29, 1991 | M.H. Humbert | Endless belt valve grinder | valve and seat maintenance | |