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| All Patents in class 361/268 | |||||
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| Number | Date | Patentee | Title | Type | |
| 287,170 | Oct. 23, 1883 | A.H. Roovers, A.W. Roovers | Electric cane | ||
| 2,162,329 | Jun. 13, 1939 | E.J. Dillman | Transformer Relay Unit | transformers | |