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| All Patents in class 251/63.4 | |||||
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| Number | Date | Patentee | Title | Type | |
| 626,121 | May 30, 1899 | A. Winton | Speed Regulator for Explosive Engines | internal combustion engine governors | |
| 1,847,073 | Mar. 01, 1932 | W. Ernst | Hydraulic Press | hydraulic presses | |