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| All Patents in class 91/318 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,763,142 | Jun. 10, 1930 | W. Ernst | Hydraulic Press | hydraulic presses | |
| 1,998,003 | Apr. 16, 1935 | L.F. Nenninger, C.W. Goodrich, H. Ernst | Hydraulic Feed Control | hydraulic apparatus | |
| 2,077,894 | Apr. 20, 1937 | I. Patrick | Surge control valve for hydraulic presses | hydraulic metalworking presses | |