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| All Patents in class 318/577 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,511,956 | Jun. 20, 1950 | T.A. Wetzel | Tracer Controlled Machine Tool | milling machines | |
| 2,832,894 | Apr. 29, 1958 | R.H. Eisengrein, R.J. W, D.A. Straznickas | Automatic machine | ||
| 2,882,476 | Apr. 14, 1959 | T.A. Wetzel | Motor Control System | milling machines | |