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| All Patents in class 336/60 | |||||
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| Number | Date | Patentee | Title | Type | |
| 422,746 | Mar. 04, 1890 | M. von Dolivo-Dobrowolsky | Electric induction apparatus or transformer | electric distribution systems | |
| 628,957 | Jul. 18, 1899 | J.W. Packard | Electric transformer | electrical devices | |
| 1,427,783 | Sep. 05, 1922 | J. Burke | Air-cooled transformer | transformers | |