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| All Patents in class 172/548 | |||||
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| Number | Date | Patentee | Title | Type | |
| 442,538 | Dec. 09, 1890 | J.P. Parker | Soil Pulverizer | harrows | |
| 1,258,882 | Mar. 12, 1918 | A.J. Dremel | Soil-milling machine | cultivators and tillers | |