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| All Patents in class 73/532 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 172,116 | Jan. 11, 1876 | A.O. Whittemore, G.W. Hall | Engine-Governor | ||
| 574,320 | Dec. 29, 1896 | A. Giesler | Electric Water Wheel Governor | ||