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| All Patents of Type: machining | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,747,271 | May 29, 1956 | W.D. Averill, E.C. Raehrs | Process of Machining | machining | |
| 2,787,796 | Apr. 09, 1957 | J. Rosan | Method of Converting Standard Threads into Locking Threads | machining | |