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| All Patents in class 72/299 | |||||
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| Number | Date | Patentee | Title | Type | |
| 392,119 | Oct. 30, 1888 | M. Hardsocg | Method of Twisting Augers | making drills and augers | |
| 437,702 | Oct. 07, 1890 | M.D. Loomis | Converting Helical Springs to Straight Bars | metal straightening machines | |
| 2,859,793 | Nov. 11, 1958 | J.L. Ross | Pivotally Mounted Laterally Spaced Fluid Pressure Means for Twisting Crankshafts | metal bending machines | |