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| All Patents in class 185/23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,152 | Jul. 01, 1841 | T.J. Wells | Horse-power for driving machinery | animal powered apparatus | |
| 35,063 | Apr. 22, 1862 | S. Perry | Improvement in circuit horse-powers | animal powered apparatus | |