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| All Patents in class 318/373 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 273,208 | Feb. 27, 1883 | S.S. Wheeler | Electric Elevatror | ||
 | 1,776,238 | Sep. 16, 1930 | R.L. Smith | Method of and mechanism for stopping rotary shaper spindles | |
| 2,331,442 | Oct. 12, 1943 | W. Trible | Plugging Switch | ||