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| All Patents in class 73/528 | |||||
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| Number | Date | Patentee | Title | Type | |
| 681,144 | Aug. 20, 1901 | F.W. Spacke | Speed Varying Pulley | traction engine governors | |
| 1,082,383 | Dec. 23, 1913 | A. Winton | Speed Governor | internal combustion engine governors | |