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| All Patents in class 172/502 | |||||
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| Number | Date | Patentee | Title | Type | |
| 54,224 | Apr. 24, 1866 | G. Simonson | Steam Plow | steam plows | |
| 263,279 | Aug. 22, 1882 | T.T. Woodruff | Steam Plow | steam plows | |
| 2,228,723 | Jan. 14, 1941 | G. Large | Plow | ||