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| All Patents in class 250/210 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,703,505 | Mar. 08, 1955 | J.A. Senn | Apparatus for Aligning Machine Elements | ||
 | 2,714,327 | Aug. 02, 1955 | A.R. Squyer, P.F. Dirksen | Photoelectric cell circuit | |
| 3,348,057 | Oct. 17, 1967 | R.K. Burroughs | Method and Apparatus for Checking the Straightness of Machine Tool Ways and the Like | ||
| 3,368,637 | Feb. 13, 1968 | R.O. Muniz, J.G. Green | Quadrature Component Detector and Suppressor | ||
| 3,831,402 | Aug. 27, 1974 | R.H. Schuman | Knitting Machine Encoder | ||