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| All Patents in class 264/320 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,251,578 | Jan. 01, 1918 | W.E. Riecken | Shaping Machine | ||
| 5,156,782 | Oct. 20, 1992 | R. Ballantyne | Maintaining press platens in parallel relationship | hydraulic metalworking presses | |