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| All Patents in class 250/231.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,406,299 | Aug. 20, 1946 | M. Koulicovitch | Machine Tool with Photoelectric Positioning of the Work Table | |
| 2,694,804 | Nov. 16, 1954 | E.K. Wagner | Positioning Device | ||