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| All Patents in class 91/451 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,931,452 | Oct. 17, 1933 | L.G. Wheeler | Hydraulic machine tool feed | ||
| 2,006,312 | Jun. 25, 1935 | B. Sassen, H. Ernst | Compensating Bleeder Valve | ||
| 2,056,910 | Oct. 06, 1936 | L.L. Schauer | Hydraulic motor unit | ||
| 2,077,894 | Apr. 20, 1937 | I. Patrick | Surge control valve for hydraulic presses | ||
| 2,570,647 | Oct. 09, 1951 | G.A. Cormier | Power Cylinder and Piston With Leakage Control | ||
 | 2,751,822 | Jun. 26, 1956 | B.P. Schiltz | Broaching machine with anti-chatter control | |