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| All Patents in class 425/547 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,226,447 | Dec. 24, 1940 | A. Allen, G. Smith | Magnetic heater | ||
| 2,226,448 | Dec. 24, 1940 | G. Smith | Magnetic field structure | ||
| 2,306,316 | Dec. 22, 1942 | L.F. Marsh | Die structure for injection molding machines | ||
| 2,350,539 | Jun. 06, 1944 | G. Smith | Automatic temperature control for injection molding machines | ||
| 2,750,628 | Jun. 19, 1956 | W.S. Renier | Heating Unit for Plastic Molding Machines | ||