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| All Patents in class 425/338 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,971,850 | Aug. 28, 1934 | W. Ernst | Press | hydraulic presses | |
| 2,775,787 | Jan. 01, 1957 | F.S. Krag | Apparatus for the manufacture of hardboard | ||
| 2,941,249 | Jun. 21, 1960 | H.H. Rogers | Multiple Opening Press | metalworking presses | |