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| All Patents in class 336/90 | |||||
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| Number | Date | Patentee | Title | Type | |
| 455,898 | Jul. 14, 1891 | C.G. Curtis | Electric Motor or Dynamo Electric Machine | electric motors | |
| 2,432,194 | Dec. 09, 1947 | R.V. Hanchett | Insulation sealing cover for electric coils | magnetic chucks | |