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| All Patents in class 409/84 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | RE22,140 | Jul. 21, 1942 | E. Lochman | Electric tracer control machine for die sinking and the like | |
 | 2,480,807 | Aug. 30, 1949 | C.B. De Vlieg | Method and apparatus for making impeller wheels | |
| 2,882,476 | Apr. 14, 1959 | T.A. Wetzel | Motor Control System | ||
| 4,643,622 | Feb. 17, 1987 | D.A. Winski | Automatic C-Axis Feedrate Control for Machine Tools | ||