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| All Patents in class 336/67 | |||||
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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 | |
| 663,454 | Dec. 11, 1900 | F.W. Martin, F. Stewart | Electric-arc lamp | electric arc lamps | |
| 2,428,234 | Sep. 30, 1947 | A.G. Mapp | Internal Micrometer | micrometers | |