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| All Patents in class 470/18 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 925,100 | Jun. 15, 1909 | L.F. Hart | Screw Cutting Device | ||
 | 2,317,099 | Apr. 20, 1943 | W.F. Groene, H.J. Siekmann | Step threading machine | |