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| All Patents in class 60/428 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,835,976 | Dec. 08, 1931 | L.F. Nenninger, H. Ernst | Machine Tool Having Hydraulic Feed | hydraulic apparatus | |
| 1,900,050 | Mar. 07, 1933 | W. Ernst | Hydraulic Press Platen Travel Equalizer | hydraulic presses | |
| 2,921,437 | Jan. 19, 1960 | E.J. Svenson | Material Working Apparatus | metalworking machine mechanisms | |