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| All Patents in class 180/6.7 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 231,569 | Aug. 24, 1880 | D.J. Havenstrite | Traction Engine | ||
| 249,451 | Nov. 15, 1881 | B.S. Benson | Traction Engine | ||
| 251,513 | Dec. 27, 1881 | B.S. Benson | Steam Plow | ||
| 484,828 | Oct. 25, 1892 | D.S. Stewart | Traction Engine | ||
| 2,843,213 | Jul. 15, 1958 | D.M. Schwartz | Material Handling Machine | ||