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| All Patents in class 222/368 | |||||
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| Number | Date | Patentee | Title | Type | |
| 253,926 | Feb. 21, 1882 | J. King | Seed-cup for grain-drills | crop planters | |
| 1,372,869 | Mar. 29, 1921 | E.R. Draver | Feed-regulator | ||