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| All Patents in class 173/178 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,727,598 | Dec. 20, 1955 | W.G. Mitchell, F.A. Kaman | Impact wrench torque control | ||
| 3,686,983 | Aug. 29, 1972 | A. Flagge | Torque applying and tension controlling device | ||