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| All Patents in class 336/229 | |||||
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| Number | Date | Patentee | Title | Type | |
| 359,205 | Mar. 08, 1887 | F.B. Crocker, S.S. Wheeler, C.G. Curtis | Armature and Process of and Apparatus for Forming the Same | electric motors | |
| 433,702 | Aug. 05, 1890 | N. Tesla | Electrical transformer or induction device | ||