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| All Patents in class 82/143 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,874,809 | Apr. 01, 1975 | R.S. Hahn | Apparatus for Machining Surface of Revolution Having Discontinuites | metalworking machine mechanisms | |
| 4,208,930 | Jun. 24, 1980 | O. Hermann | Spindle Control Mechanism | machine tool controls | |