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| All Patents in class 174/138E | |||||
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| Number | Date | Patentee | Title | Type | |
| 491,708 | Feb. 14, 1893 | C.W. Jefferson | Electric Motor and Dynamo Mica Insulator | electrical insulation | |
| 1,284,524 | Nov. 12, 1918 | C.E. Wilson, W.H. Kempton, A.J. Bastian | Molded commutator-cylinder | motor commutators | |
| 2,180,983 | Nov. 21, 1939 | R.W. Hall | Dynamo-electric machine | electric motors | |