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| All Patents in class 250/232 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,375,665 | May 08, 1945 | M. Koulicovitch | Electric Devive for Signaling the Position of a Movable Mark | ||
| 2,720,810 | Oct. 18, 1955 | J.A. Senn | Measuring Instrument | milling machine accessories | |