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| All Patents in class 318/375 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,535,183 | Dec. 26, 1950 | J.C. Wilson | Grinding Wheel Dressing Apparatus | grinder dressers | |
| 4,568,864 | Feb. 04, 1986 | E.T. Gisske | Electric motor control for a pipe bender | electrical conduit apparatus | |