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| All Patents in class 60/721 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,546X | May 07, 1831 | W.E. Arnold | Applying Horse Power to Mechanical Purposes | animal powered apparatus | |
| 6,610X | Jun. 13, 1831 | I. VanDoren | Thrashing Machine | animal powered apparatus | |
| 2,137,462 | Nov. 22, 1938 | M. Romaine | Index Head | indexers and dividers | |