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| All Patents in class 411/964 | |||||
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| Number | Date | Patentee | Title | Type | |
| 982,510 | Jan. 24, 1911 | G.O. Leopold | Ratchet mechanism | eggbeater drills | |
| 1,530,505 | Mar. 24, 1925 | A. Levedahl | Stuffing box | ||