| All Patents in class 91/451 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 1,931,452 | Oct. 17, 1933 | L.G. Wheeler | Hydraulic machine tool feed | multiple spindle drill presses |
| 2,006,312 | Jun. 25, 1935 | B. Sassen, H. Ernst | Compensating Bleeder Valve | hydraulic apparatus |
| 2,056,910 | Oct. 06, 1936 | L.L. Schauer | Hydraulic motor unit | metalworking machine mechanisms |
| 2,077,894 | Apr. 20, 1937 | I. Patrick | Surge control valve for hydraulic presses | hydraulic metalworking presses |
| 2,570,647 | Oct. 09, 1951 | G.A. Cormier | Power Cylinder and Piston With Leakage Control | hydraulic apparatus |
| 2,751,822 | Jun. 26, 1956 | B.P. Schiltz | Broaching machine with anti-chatter control | broaching machines |
