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| All Patents in class 318/13 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,963,827 | Jun. 19, 1934 | H.C. Clay | Variable Speed Unit Control | ||
| 2,347,259 | Apr. 25, 1944 | W.L. Groene | Lathe Headstock Transmission | ||