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| All Patents in class 219/478 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,044,269 | Nov. 12, 1912 | C.A. Shaler | Electrical heating unit | pressing irons | |
| 2,309,496 | Jan. 26, 1943 | G. Smith, L.F. Marsh, E.S. Bird | Heating apparatus for injection molding machines | plastic molding machines | |