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| All Patents in class 81/470 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,616,323 | Nov. 04, 1952 | L.A. Leifer | Power Actuated Wrench | metal lathe accessories and attachments | |
| 2,953,903 | Sep. 27, 1960 | L. Kramer, D.K. Skoog | Hydraulic system for operating simultaneously a plurality of power units | ||
| 3,686,983 | Aug. 29, 1972 | A. Flagge | Torque applying and tension controlling device | ||