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| All Patents in class 222/56 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 421,556 | Feb. 18, 1890 | C.H. Cooley | Automatic regulator for grain-scales | ||
| 434,702 | Aug. 19, 1890 | F.H. Richards, C.H. Cooley | Grain-weigher | ||
| 434,723 | Aug. 19, 1890 | F.H. Richards | Regulator for Grain Weighers | ||