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| All Patents in class 219/630 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,226,447 | Dec. 24, 1940 | A. Allen, G. Smith | Magnetic heater | plastic molding machines | |
| 2,226,448 | Dec. 24, 1940 | G. Smith | Magnetic field structure | plastic molding machines | |