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| All Patents in class 318/470 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,342,915 | Jun. 08, 1920 | S.P. Johnson | Electric feed mechanism for planers and current-controlling system therefor | metal planers | |
| 2,864,046 | Dec. 09, 1958 | W.B. Ailes | Electrical control system | ||
| 2,873,416 | Feb. 10, 1959 | K.C. Allen | Weighing scale adapted servomotor system | ||