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| All Patents in class 335/266 | |||||
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| Number | Date | Patentee | Title | Type | |
| 422,512 | Mar. 04, 1890 | R. Eickemeyer | Electro-magnet | ||
| 2,494,491 | Jan. 10, 1950 | O.E. Rosaen | Ironclad Electromagnet with Pivoted Armature | electromagnets | |