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| All Patents in class 318/630 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,741,732 | Apr. 10, 1956 | F.W. Cunningham | Motor Control System for Automatic Machine Tools | ||
| 2,876,650 | Mar. 10, 1959 | A.G. Sangster | Apparatus for automatically relatively positioning workholders, tools and the like | ||
| 3,339,122 | Aug. 29, 1967 | A.G. Sangster | Digital Positional Control | ||
| 4,533,859 | Aug. 06, 1985 | R. Johnstone | Motorized Ball Nut | ||