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| All Patents in class 310/215 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 480,728 | Aug. 16, 1892 | E. Kolben | Ring-armature | |
| 491,708 | Feb. 14, 1893 | C.W. Jefferson | Electric Motor and Dynamo Mica Insulator | ||
 | 1,675,419 | Jul. 03, 1928 | G.T. Pfleger | Process of insulating motor windings | |
 | 2,180,983 | Nov. 21, 1939 | R.W. Hall | Dynamo-electric machine | |