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| All Patents in class 425/326.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,222,720 | Dec. 14, 1965 | R.P. Hyland, S. Saslawsky | Heater indicating means for extrusion system | ||
 | 3,241,185 | Mar. 22, 1966 | R.A. Hufford | Extruder with means to vary ram pressure | |