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| All Patents in class 318/467 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,546,692 | Mar. 27, 1951 | R.B. Lesher, C.E. Greene | Control System | ||
| 2,619,880 | Dec. 02, 1952 | E.E. Hosea | Machine tool | ||
| 2,698,413 | Dec. 28, 1954 | L.W. Thompson | Motor Control System for Positioning Devices | ||
| 3,339,122 | Aug. 29, 1967 | A.G. Sangster | Digital Positional Control | ||