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| All Patents in class 318/274 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 273,208 | Feb. 27, 1883 | S.S. Wheeler | Electric Elevatror | ||
 | 789,572 | May 09, 1905 | C.A. Stauffer | Controller for electric motors | |
| 1,084,590 | Jan. 13, 1914 | H.L. Zabriskie | Electric motor | ||
| 2,441,291 | May 11, 1948 | E.J. Riveira | Spindle Positioning Mechanism | ||