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| All Patents in class 425/146 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,565,522 | Aug. 28, 1951 | W.S. Renier | Molding Machine | plastic molding machines | |
| 3,241,185 | Mar. 22, 1966 | R.A. Hufford | Extruder with means to vary ram pressure | ||