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| All Patents in class 338/241 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,394,937 | Oct. 25, 1921 | L. Reichold | Resistance Unit | ||
| 1,432,434 | Oct. 17, 1922 | C.C. Abbot | Heating Unit | ||
| 1,708,961 | Apr. 16, 1929 | C.C. Abbot | Electric Heater | ||