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| All Patents in class 336/219 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,540,789 | Jun. 09, 1925 | C.M. McCord | Testing transformer | transformers | |
| 2,279,014 | Apr. 07, 1942 | M.B. Sawyer | Electromagnetic apparatus | induction motors | |