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| All Patents in class 250/214R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,891,777 | Dec. 20, 1932 | A.G. Plimmer | Grinding Machine | grinding machines | |
| 2,375,665 | May 08, 1945 | M. Koulicovitch | Electric Devive for Signaling the Position of a Movable Mark | ||
| 3,019,343 | Jan. 30, 1962 | R.L. Henry | Universal Line Trcer | profiling machines | |