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| All Patents in class 222/59 | |||||
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| Number | Date | Patentee | Title | Type | |
| 984,780 | Feb. 21, 1911 | A. Savage | Alarm feed-regulator and speed-indicator | grist mills | |
| 2,997,207 | Aug. 22, 1961 | K.D. Allen, L.A. Botkin | Flow control valve | ||