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| All Patents in class 470/82 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,220,348 | Mar. 27, 1917 | A.B. Landis | Cutter-head | metal threading machines | |
| 1,721,129 | Jul. 16, 1929 | G.M. Mehl | Adjusting Means for Threading Dies | tap and die holders | |