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| Patents Granted on 1981-11-17 | |||||
| Number | Date | Patentee | Title | Type | |
| 4,300,271 | Nov. 17, 1981 | G. Wohlhaupter | Clamping device for a sliding mount | boring heads | |
| 4,300,418 | Nov. 17, 1981 | T.R. Wagner, N.V. Gusching | Tool turret mechanism | ||