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| All Patents in class 307/104 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 599,892 | Mar. 01, 1898 | W.H. Chapman | Electric regulator for dynamos | |
 | 1,949,727 | Mar. 06, 1934 | J.D. Nies | Electric brake for slip-ring motors | |