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| All Patents in class 72/255 | |||||
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| Number | Date | Patentee | Title | Type | |
| 638,808 | Dec. 12, 1899 | E.F. Holinger | Vertical Piercing-Press. | ||
| 2,167,845 | Aug. 01, 1939 | W. Klocke | Extrusion process and apparatus | extruding machines and dies | |