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| All Patents in class 403/404 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,767,339 | Oct. 16, 1956 | D.O. Hatfield | Dynamoelectric rotor | synchronous motors | |
| 3,170,735 | Feb. 23, 1965 | H.H. Coffin | Insulated die set | tool and die maker | |