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| All Patents in class 250/237R | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,291,114 | Jul. 28, 1942 | A.R. Squyer | Headlight tester | |
| 2,375,665 | May 08, 1945 | M. Koulicovitch | Electric Devive for Signaling the Position of a Movable Mark | ||
| 2,416,968 | Mar. 04, 1947 | F. Turrettini | Stroboscopic Device for Determining Electrically the Position of an Object | ||
| 2,694,804 | Nov. 16, 1954 | E.K. Wagner | Positioning Device | ||
| 2,720,810 | Oct. 18, 1955 | J.A. Senn | Measuring Instrument | ||