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| All Patents in class 180/21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 408,229 | Aug. 06, 1889 | T.J. Frazier | Steam Motor | steam motors | |
| 1,599,196 | Sep. 07, 1926 | C.C. Baldwin | Power Propelled Device | harvesters | |