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| All Patents in class 318/452 | |||||
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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 | |
| 2,300,838 | Nov. 03, 1942 | C.H. Dicke | Stoker motor control | motor controls | |