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| All Patents in class 408/176 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,794,963 | Mar. 03, 1931 | E.A. Kane | Threading Die and Holder | taps and dies | |
| 2,017,764 | Oct. 15, 1935 | S.W. Mathias | Threading Machine | metal threading machines | |